Remove unused #include

[dolphin.git] / src / kitemviews / kfileitemmodel.cpp

diff --git a/src/kitemviews/kfileitemmodel.cpp b/src/kitemviews/kfileitemmodel.cpp
index d4c08a52e07ea9f0dee6669245adb138b6cf67c6..70014e1a758ba754570222abc70a3e0aa245bc89 100644 (file)
--- a/src/kitemviews/kfileitemmodel.cpp
+++ b/src/kitemviews/kfileitemmodel.cpp
@@ -1,34 +1,37 @@
-/***************************************************************************
- *   Copyright (C) 2011 by Peter Penz <peter.penz19@gmail.com>             *
- *                                                                         *
- *   This program is free software; you can redistribute it and/or modify  *
- *   it under the terms of the GNU General Public License as published by  *
- *   the Free Software Foundation; either version 2 of the License, or     *
- *   (at your option) any later version.                                   *
- *                                                                         *
- *   This program is distributed in the hope that it will be useful,       *
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
- *   GNU General Public License for more details.                          *
- *                                                                         *
- *   You should have received a copy of the GNU General Public License     *
- *   along with this program; if not, write to the                         *
- *   Free Software Foundation, Inc.,                                       *
- *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
- ***************************************************************************/
+/*****************************************************************************
+ *   Copyright (C) 2011 by Peter Penz <peter.penz19@gmail.com>               *
+ *   Copyright (C) 2013 by Frank Reininghaus <frank78ac@googlemail.com>      *
+ *   Copyright (C) 2013 by Emmanuel Pescosta <emmanuelpescosta099@gmail.com> *
+ *                                                                           *
+ *   This program is free software; you can redistribute it and/or modify    *
+ *   it under the terms of the GNU General Public License as published by    *
+ *   the Free Software Foundation; either version 2 of the License, or       *
+ *   (at your option) any later version.                                     *
+ *                                                                           *
+ *   This program is distributed in the hope that it will be useful,         *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of          *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           *
+ *   GNU General Public License for more details.                            *
+ *                                                                           *
+ *   You should have received a copy of the GNU General Public License       *
+ *   along with this program; if not, write to the                           *
+ *   Free Software Foundation, Inc.,                                         *
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA              *
+ *****************************************************************************/

 
 #include "kfileitemmodel.h"
 
 
 #include "kfileitemmodel.h"
 

-#include <KDirModel>
-#include <KGlobalSettings>
-#include <KLocale>
-#include <KStringHandler>
-#include <KDebug>
+#include "dolphin_generalsettings.h"
+
+#include <KLocalizedString>
+#include <KUrlMimeData>
+
+#include "dolphindebug.h"

 
 #include "private/kfileitemmodelsortalgorithm.h"
 #include "private/kfileitemmodeldirlister.h"
 
 
 #include "private/kfileitemmodelsortalgorithm.h"
 #include "private/kfileitemmodeldirlister.h"
 

-#include <QApplication>
+#include <QElapsedTimer>

 #include <QMimeData>
 #include <QTimer>
 #include <QWidget>
 #include <QMimeData>
 #include <QTimer>
 #include <QWidget>


@@ -37,28 +40,28 @@
 
 KFileItemModel::KFileItemModel(QObject* parent) :
     KItemModelBase("text", parent),
 
 KFileItemModel::KFileItemModel(QObject* parent) :
     KItemModelBase("text", parent),

-    m_dirLister(0),
-    m_naturalSorting(KGlobalSettings::naturalSorting()),
+    m_dirLister(nullptr),

     m_sortDirsFirst(true),
     m_sortRole(NameRole),
     m_sortingProgressPercent(-1),
     m_roles(),
     m_sortDirsFirst(true),
     m_sortRole(NameRole),
     m_sortingProgressPercent(-1),
     m_roles(),

-    m_caseSensitivity(Qt::CaseInsensitive),

     m_itemData(),
     m_items(),
     m_filter(),
     m_filteredItems(),
     m_requestRole(),
     m_itemData(),
     m_items(),
     m_filter(),
     m_filteredItems(),
     m_requestRole(),

-    m_maximumUpdateIntervalTimer(0),
-    m_resortAllItemsTimer(0),
+    m_maximumUpdateIntervalTimer(nullptr),
+    m_resortAllItemsTimer(nullptr),

     m_pendingItemsToInsert(),
     m_groups(),
     m_pendingItemsToInsert(),
     m_groups(),

-    m_expandedParentsCountRoot(UninitializedExpandedParentsCountRoot),

     m_expandedDirs(),
     m_urlsToExpand()
 {
     m_expandedDirs(),
     m_urlsToExpand()
 {

+    m_collator.setNumericMode(true);
+
+    loadSortingSettings();
+

     m_dirLister = new KFileItemModelDirLister(this);
     m_dirLister = new KFileItemModelDirLister(this);

-    m_dirLister->setAutoUpdate(true);

     m_dirLister->setDelayedMimeTypes(true);
 
     const QWidget* parentWidget = qobject_cast<QWidget*>(parent);
     m_dirLister->setDelayedMimeTypes(true);
 
     const QWidget* parentWidget = qobject_cast<QWidget*>(parent);


@@ -66,18 +69,18 @@ KFileItemModel::KFileItemModel(QObject* parent) :
         m_dirLister->setMainWindow(parentWidget->window());
     }
 
         m_dirLister->setMainWindow(parentWidget->window());
     }
 

-    connect(m_dirLister, SIGNAL(started(KUrl)), this, SIGNAL(directoryLoadingStarted()));
-    connect(m_dirLister, SIGNAL(canceled()), this, SLOT(slotCanceled()));
-    connect(m_dirLister, SIGNAL(completed(KUrl)), this, SLOT(slotCompleted()));
-    connect(m_dirLister, SIGNAL(newItems(KFileItemList)), this, SLOT(slotNewItems(KFileItemList)));
-    connect(m_dirLister, SIGNAL(itemsDeleted(KFileItemList)), this, SLOT(slotItemsDeleted(KFileItemList)));
-    connect(m_dirLister, SIGNAL(refreshItems(QList<QPair<KFileItem,KFileItem> >)), this, SLOT(slotRefreshItems(QList<QPair<KFileItem,KFileItem> >)));
-    connect(m_dirLister, SIGNAL(clear()), this, SLOT(slotClear()));
-    connect(m_dirLister, SIGNAL(clear(KUrl)), this, SLOT(slotClear(KUrl)));
-    connect(m_dirLister, SIGNAL(infoMessage(QString)), this, SIGNAL(infoMessage(QString)));
-    connect(m_dirLister, SIGNAL(errorMessage(QString)), this, SIGNAL(errorMessage(QString)));
-    connect(m_dirLister, SIGNAL(redirection(KUrl,KUrl)), this, SIGNAL(directoryRedirection(KUrl,KUrl)));
-    connect(m_dirLister, SIGNAL(urlIsFileError(KUrl)), this, SIGNAL(urlIsFileError(KUrl)));
+    connect(m_dirLister, &KFileItemModelDirLister::started, this, &KFileItemModel::directoryLoadingStarted);
+    connect(m_dirLister, static_cast<void(KFileItemModelDirLister::*)()>(&KFileItemModelDirLister::canceled), this, &KFileItemModel::slotCanceled);
+    connect(m_dirLister, static_cast<void(KFileItemModelDirLister::*)(const QUrl&)>(&KFileItemModelDirLister::completed), this, &KFileItemModel::slotCompleted);
+    connect(m_dirLister, &KFileItemModelDirLister::itemsAdded, this, &KFileItemModel::slotItemsAdded);
+    connect(m_dirLister, &KFileItemModelDirLister::itemsDeleted, this, &KFileItemModel::slotItemsDeleted);
+    connect(m_dirLister, &KFileItemModelDirLister::refreshItems, this, &KFileItemModel::slotRefreshItems);
+    connect(m_dirLister, static_cast<void(KFileItemModelDirLister::*)()>(&KFileItemModelDirLister::clear), this, &KFileItemModel::slotClear);
+    connect(m_dirLister, &KFileItemModelDirLister::infoMessage, this, &KFileItemModel::infoMessage);
+    connect(m_dirLister, &KFileItemModelDirLister::errorMessage, this, &KFileItemModel::errorMessage);
+    connect(m_dirLister, &KFileItemModelDirLister::percent, this, &KFileItemModel::directoryLoadingProgress);
+    connect(m_dirLister, static_cast<void(KFileItemModelDirLister::*)(const QUrl&, const QUrl&)>(&KFileItemModelDirLister::redirection), this, &KFileItemModel::directoryRedirection);
+    connect(m_dirLister, &KFileItemModelDirLister::urlIsFileError, this, &KFileItemModel::urlIsFileError);

 
     // Apply default roles that should be determined
     resetRoles();
 
     // Apply default roles that should be determined
     resetRoles();


@@ -87,13 +90,14 @@ KFileItemModel::KFileItemModel(QObject* parent) :
     m_roles.insert("text");
     m_roles.insert("isDir");
     m_roles.insert("isLink");
     m_roles.insert("text");
     m_roles.insert("isDir");
     m_roles.insert("isLink");

+    m_roles.insert("isHidden");

 
     // For slow KIO-slaves like used for searching it makes sense to show results periodically even
     // before the completed() or canceled() signal has been emitted.
     m_maximumUpdateIntervalTimer = new QTimer(this);
     m_maximumUpdateIntervalTimer->setInterval(2000);
     m_maximumUpdateIntervalTimer->setSingleShot(true);
 
     // For slow KIO-slaves like used for searching it makes sense to show results periodically even
     // before the completed() or canceled() signal has been emitted.
     m_maximumUpdateIntervalTimer = new QTimer(this);
     m_maximumUpdateIntervalTimer->setInterval(2000);
     m_maximumUpdateIntervalTimer->setSingleShot(true);

-    connect(m_maximumUpdateIntervalTimer, SIGNAL(timeout()), this, SLOT(dispatchPendingItemsToInsert()));
+    connect(m_maximumUpdateIntervalTimer, &QTimer::timeout, this, &KFileItemModel::dispatchPendingItemsToInsert);

 
     // When changing the value of an item which represents the sort-role a resorting must be
     // triggered. Especially in combination with KFileItemModelRolesUpdater this might be done
 
     // When changing the value of an item which represents the sort-role a resorting must be
     // triggered. Especially in combination with KFileItemModelRolesUpdater this might be done


@@ -102,28 +106,36 @@ KFileItemModel::KFileItemModel(QObject* parent) :
     m_resortAllItemsTimer = new QTimer(this);
     m_resortAllItemsTimer->setInterval(500);
     m_resortAllItemsTimer->setSingleShot(true);
     m_resortAllItemsTimer = new QTimer(this);
     m_resortAllItemsTimer->setInterval(500);
     m_resortAllItemsTimer->setSingleShot(true);

-    connect(m_resortAllItemsTimer, SIGNAL(timeout()), this, SLOT(resortAllItems()));
+    connect(m_resortAllItemsTimer, &QTimer::timeout, this, &KFileItemModel::resortAllItems);

 
 

-    connect(KGlobalSettings::self(), SIGNAL(naturalSortingChanged()), this, SLOT(slotNaturalSortingChanged()));
+    connect(GeneralSettings::self(), &GeneralSettings::sortingChoiceChanged, this, &KFileItemModel::slotSortingChoiceChanged);

 }
 
 KFileItemModel::~KFileItemModel()
 {
     qDeleteAll(m_itemData);
 }
 
 KFileItemModel::~KFileItemModel()
 {
     qDeleteAll(m_itemData);

-    m_itemData.clear();
+    qDeleteAll(m_filteredItems);
+    qDeleteAll(m_pendingItemsToInsert);

 }
 
 }
 

-void KFileItemModel::loadDirectory(const KUrl& url)
+void KFileItemModel::loadDirectory(const QUrl &url)

 {
     m_dirLister->openUrl(url);
 }
 
 {
     m_dirLister->openUrl(url);
 }
 

-void KFileItemModel::refreshDirectory(const KUrl& url)
+void KFileItemModel::refreshDirectory(const QUrl &url)

 {
 {

+    // Refresh all expanded directories first (Bug 295300)
+    QHashIterator<QUrl, QUrl> expandedDirs(m_expandedDirs);
+    while (expandedDirs.hasNext()) {
+        expandedDirs.next();
+        m_dirLister->openUrl(expandedDirs.value(), KDirLister::Reload);
+    }
+

     m_dirLister->openUrl(url, KDirLister::Reload);
 }
 
     m_dirLister->openUrl(url, KDirLister::Reload);
 }
 

-KUrl KFileItemModel::directory() const
+QUrl KFileItemModel::directory() const

 {
     return m_dirLister->url();
 }
 {
     return m_dirLister->url();
 }


@@ -141,7 +153,12 @@ int KFileItemModel::count() const
 QHash<QByteArray, QVariant> KFileItemModel::data(int index) const
 {
     if (index >= 0 && index < count()) {
 QHash<QByteArray, QVariant> KFileItemModel::data(int index) const
 {
     if (index >= 0 && index < count()) {

-        return m_itemData.at(index)->values;
+        ItemData* data = m_itemData.at(index);
+        if (data->values.isEmpty()) {
+            data->values = retrieveData(data->item, data->parent);
+        }
+
+        return data->values;

     }
     return QHash<QByteArray, QVariant>();
 }
     }
     return QHash<QByteArray, QVariant>();
 }


@@ -152,14 +169,14 @@ bool KFileItemModel::setData(int index, const QHash<QByteArray, QVariant>& value
         return false;
     }
 
         return false;
     }
 

-    QHash<QByteArray, QVariant> currentValues = m_itemData.at(index)->values;
+    QHash<QByteArray, QVariant> currentValues = data(index);

 
     // Determine which roles have been changed
     QSet<QByteArray> changedRoles;
     QHashIterator<QByteArray, QVariant> it(values);
     while (it.hasNext()) {
         it.next();
 
     // Determine which roles have been changed
     QSet<QByteArray> changedRoles;
     QHashIterator<QByteArray, QVariant> it(values);
     while (it.hasNext()) {
         it.next();

-        const QByteArray role = it.key();
+        const QByteArray role = sharedValue(it.key());

         const QVariant value = it.value();
 
         if (currentValues[role] != value) {
         const QVariant value = it.value();
 
         if (currentValues[role] != value) {


@@ -174,16 +191,13 @@ bool KFileItemModel::setData(int index, const QHash<QByteArray, QVariant>& value
 
     m_itemData[index]->values = currentValues;
     if (changedRoles.contains("text")) {
 
     m_itemData[index]->values = currentValues;
     if (changedRoles.contains("text")) {

-        KUrl url = m_itemData[index]->item.url();
-        url.setFileName(currentValues["text"].toString());
+        QUrl url = m_itemData[index]->item.url();
+        url = url.adjusted(QUrl::RemoveFilename);
+        url.setPath(url.path() + currentValues["text"].toString());

         m_itemData[index]->item.setUrl(url);
     }
 
         m_itemData[index]->item.setUrl(url);
     }
 

-    emit itemsChanged(KItemRangeList() << KItemRange(index, 1), changedRoles);
-
-    if (changedRoles.contains(sortRole())) {
-        m_resortAllItemsTimer->start();
-    }
+    emitItemsChangedAndTriggerResorting(KItemRangeList() << KItemRange(index, 1), changedRoles);

 
     return true;
 }
 
     return true;
 }


@@ -206,7 +220,7 @@ void KFileItemModel::setShowHiddenFiles(bool show)
     m_dirLister->setShowingDotFiles(show);
     m_dirLister->emitChanges();
     if (show) {
     m_dirLister->setShowingDotFiles(show);
     m_dirLister->emitChanges();
     if (show) {

-        slotCompleted();
+        dispatchPendingItemsToInsert();

     }
 }
 
     }
 }
 


@@ -225,21 +239,33 @@ bool KFileItemModel::showDirectoriesOnly() const
     return m_dirLister->dirOnlyMode();
 }
 
     return m_dirLister->dirOnlyMode();
 }
 

-QMimeData* KFileItemModel::createMimeData(const QSet<int>& indexes) const
+QMimeData* KFileItemModel::createMimeData(const KItemSet& indexes) const

 {
     QMimeData* data = new QMimeData();
 
     // The following code has been taken from KDirModel::mimeData()
     // (kdelibs/kio/kio/kdirmodel.cpp)
     // Copyright (C) 2006 David Faure <faure@kde.org>
 {
     QMimeData* data = new QMimeData();
 
     // The following code has been taken from KDirModel::mimeData()
     // (kdelibs/kio/kio/kdirmodel.cpp)
     // Copyright (C) 2006 David Faure <faure@kde.org>

-    KUrl::List urls;
-    KUrl::List mostLocalUrls;
+    QList<QUrl> urls;
+    QList<QUrl> mostLocalUrls;

     bool canUseMostLocalUrls = true;
     bool canUseMostLocalUrls = true;

+    const ItemData* lastAddedItem = nullptr;

 
 

-    QSetIterator<int> it(indexes);
-    while (it.hasNext()) {
-        const int index = it.next();
-        const KFileItem item = fileItem(index);
+    for (int index : indexes) {
+        const ItemData* itemData = m_itemData.at(index);
+        const ItemData* parent = itemData->parent;
+
+        while (parent && parent != lastAddedItem) {
+            parent = parent->parent;
+        }
+
+        if (parent && parent == lastAddedItem) {
+            // A parent of 'itemData' has been added already.
+            continue;
+        }
+
+        lastAddedItem = itemData;
+        const KFileItem& item = itemData->item;

         if (!item.isNull()) {
             urls << item.url();
 
         if (!item.isNull()) {
             urls << item.url();
 


@@ -251,15 +277,7 @@ QMimeData* KFileItemModel::createMimeData(const QSet<int>& indexes) const
         }
     }
 
         }
     }
 

-    const bool different = canUseMostLocalUrls && mostLocalUrls != urls;
-    urls = KDirModel::simplifiedUrlList(urls); // TODO: Check if we still need KDirModel for this in KDE 5.0
-    if (different) {
-        mostLocalUrls = KDirModel::simplifiedUrlList(mostLocalUrls);
-        urls.populateMimeData(mostLocalUrls, data);
-    } else {
-        urls.populateMimeData(data);
-    }
-
+    KUrlMimeData::setUrls(urls, mostLocalUrls, data);

     return data;
 }
 
     return data;
 }
 


@@ -267,12 +285,12 @@ int KFileItemModel::indexForKeyboardSearch(const QString& text, int startFromInd
 {
     startFromIndex = qMax(0, startFromIndex);
     for (int i = startFromIndex; i < count(); ++i) {
 {
     startFromIndex = qMax(0, startFromIndex);
     for (int i = startFromIndex; i < count(); ++i) {

-        if (data(i)["text"].toString().startsWith(text, Qt::CaseInsensitive)) {
+        if (fileItem(i).text().startsWith(text, Qt::CaseInsensitive)) {

             return i;
         }
     }
     for (int i = 0; i < startFromIndex; ++i) {
             return i;
         }
     }
     for (int i = 0; i < startFromIndex; ++i) {

-        if (data(i)["text"].toString().startsWith(text, Qt::CaseInsensitive)) {
+        if (fileItem(i).text().startsWith(text, Qt::CaseInsensitive)) {

             return i;
         }
     }
             return i;
         }
     }


@@ -309,14 +327,33 @@ QList<QPair<int, QVariant> > KFileItemModel::groups() const
         switch (typeForRole(sortRole())) {
         case NameRole:        m_groups = nameRoleGroups(); break;
         case SizeRole:        m_groups = sizeRoleGroups(); break;
         switch (typeForRole(sortRole())) {
         case NameRole:        m_groups = nameRoleGroups(); break;
         case SizeRole:        m_groups = sizeRoleGroups(); break;

-        case DateRole:        m_groups = dateRoleGroups(); break;
+        case ModificationTimeRole:
+            m_groups = timeRoleGroups([](const ItemData *item) {
+                return item->item.time(KFileItem::ModificationTime);
+            });
+            break;
+        case CreationTimeRole:
+            m_groups = timeRoleGroups([](const ItemData *item) {
+                return item->item.time(KFileItem::CreationTime);
+            });
+            break;
+        case AccessTimeRole:
+            m_groups = timeRoleGroups([](const ItemData *item) {
+                return item->item.time(KFileItem::AccessTime);
+            });
+            break;
+        case DeletionTimeRole:
+            m_groups = timeRoleGroups([](const ItemData *item) {
+                return item->values.value("deletiontime").toDateTime();
+            });
+            break;

         case PermissionsRole: m_groups = permissionRoleGroups(); break;
         case RatingRole:      m_groups = ratingRoleGroups(); break;
         default:              m_groups = genericStringRoleGroups(sortRole()); break;
         }
 
 #ifdef KFILEITEMMODEL_DEBUG
         case PermissionsRole: m_groups = permissionRoleGroups(); break;
         case RatingRole:      m_groups = ratingRoleGroups(); break;
         default:              m_groups = genericStringRoleGroups(sortRole()); break;
         }
 
 #ifdef KFILEITEMMODEL_DEBUG

-        kDebug() << "[TIME] Calculating groups for" << count() << "items:" << timer.elapsed();
+        qCDebug(DolphinDebug) << "[TIME] Calculating groups for" << count() << "items:" << timer.elapsed();

 #endif
     }
 
 #endif
     }
 


@@ -332,29 +369,88 @@ KFileItem KFileItemModel::fileItem(int index) const
     return KFileItem();
 }
 
     return KFileItem();
 }
 

-KFileItem KFileItemModel::fileItem(const KUrl& url) const
+KFileItem KFileItemModel::fileItem(const QUrl &url) const

 {
 {

-    const int index = m_items.value(url, -1);
-    if (index >= 0) {
-        return m_itemData.at(index)->item;
+    const int indexForUrl = index(url);
+    if (indexForUrl >= 0) {
+        return m_itemData.at(indexForUrl)->item;

     }
     return KFileItem();
 }
 
 int KFileItemModel::index(const KFileItem& item) const
 {
     }
     return KFileItem();
 }
 
 int KFileItemModel::index(const KFileItem& item) const
 {

-    if (item.isNull()) {
-        return -1;
-    }
-
-    return m_items.value(item.url(), -1);
+    return index(item.url());

 }
 
 }
 

-int KFileItemModel::index(const KUrl& url) const
+int KFileItemModel::index(const QUrl& url) const

 {
 {

-    KUrl urlToFind = url;
-    urlToFind.adjustPath(KUrl::RemoveTrailingSlash);
-    return m_items.value(urlToFind, -1);
+    const QUrl urlToFind = url.adjusted(QUrl::StripTrailingSlash);
+
+    const int itemCount = m_itemData.count();
+    int itemsInHash = m_items.count();
+
+    int index = m_items.value(urlToFind, -1);
+    while (index < 0 && itemsInHash < itemCount) {
+        // Not all URLs are stored yet in m_items. We grow m_items until either
+        // urlToFind is found, or all URLs have been stored in m_items.
+        // Note that we do not add the URLs to m_items one by one, but in
+        // larger blocks. After each block, we check if urlToFind is in
+        // m_items. We could in principle compare urlToFind with each URL while
+        // we are going through m_itemData, but comparing two QUrls will,
+        // unlike calling qHash for the URLs, trigger a parsing of the URLs
+        // which costs both CPU cycles and memory.
+        const int blockSize = 1000;
+        const int currentBlockEnd = qMin(itemsInHash + blockSize, itemCount);
+        for (int i = itemsInHash; i < currentBlockEnd; ++i) {
+            const QUrl nextUrl = m_itemData.at(i)->item.url();
+            m_items.insert(nextUrl, i);
+        }
+
+        itemsInHash = currentBlockEnd;
+        index = m_items.value(urlToFind, -1);
+    }
+
+    if (index < 0) {
+        // The item could not be found, even though all items from m_itemData
+        // should be in m_items now. We print some diagnostic information which
+        // might help to find the cause of the problem, but only once. This
+        // prevents that obtaining and printing the debugging information
+        // wastes CPU cycles and floods the shell or .xsession-errors.
+        static bool printDebugInfo = true;
+
+        if (m_items.count() != m_itemData.count() && printDebugInfo) {
+            printDebugInfo = false;
+
+            qCWarning(DolphinDebug) << "The model is in an inconsistent state.";
+            qCWarning(DolphinDebug) << "m_items.count()    ==" << m_items.count();
+            qCWarning(DolphinDebug) << "m_itemData.count() ==" << m_itemData.count();
+
+            // Check if there are multiple items with the same URL.
+            QMultiHash<QUrl, int> indexesForUrl;
+            for (int i = 0; i < m_itemData.count(); ++i) {
+                indexesForUrl.insert(m_itemData.at(i)->item.url(), i);
+            }
+
+            foreach (const QUrl& url, indexesForUrl.uniqueKeys()) {
+                if (indexesForUrl.count(url) > 1) {
+                    qCWarning(DolphinDebug) << "Multiple items found with the URL" << url;
+
+                    auto it = indexesForUrl.find(url);
+                    while (it != indexesForUrl.end() && it.key() == url) {
+                        const ItemData* data = m_itemData.at(it.value());
+                        qCWarning(DolphinDebug) << "index" << it.value() << ":" << data->item;
+                        if (data->parent) {
+                            qCWarning(DolphinDebug) << "parent" << data->parent->item;
+                        }
+                        ++it;
+                    }
+                }
+            }
+        }
+    }
+
+    return index;

 }
 
 KFileItem KFileItemModel::rootItem() const
 }
 
 KFileItem KFileItemModel::rootItem() const


@@ -372,6 +468,8 @@ void KFileItemModel::setRoles(const QSet<QByteArray>& roles)
     if (m_roles == roles) {
         return;
     }
     if (m_roles == roles) {
         return;
     }

+
+    const QSet<QByteArray> changedRoles = (roles - m_roles) + (m_roles - roles);

     m_roles = roles;
 
     if (count() > 0) {
     m_roles = roles;
 
     if (count() > 0) {


@@ -397,11 +495,19 @@ void KFileItemModel::setRoles(const QSet<QByteArray>& roles)
         // Update m_data with the changed requested roles
         const int maxIndex = count() - 1;
         for (int i = 0; i <= maxIndex; ++i) {
         // Update m_data with the changed requested roles
         const int maxIndex = count() - 1;
         for (int i = 0; i <= maxIndex; ++i) {

-            m_itemData[i]->values = retrieveData(m_itemData.at(i)->item);
+            m_itemData[i]->values = retrieveData(m_itemData.at(i)->item, m_itemData.at(i)->parent);

         }
 
         }
 

-        kWarning() << "TODO: Emitting itemsChanged() with no information what has changed!";
-        emit itemsChanged(KItemRangeList() << KItemRange(0, count()), QSet<QByteArray>());
+        emit itemsChanged(KItemRangeList() << KItemRange(0, count()), changedRoles);
+    }
+
+    // Clear the 'values' of all filtered items. They will be re-populated with the
+    // correct roles the next time 'values' will be accessed via data(int).
+    QHash<KFileItem, ItemData*>::iterator filteredIt = m_filteredItems.begin();
+    const QHash<KFileItem, ItemData*>::iterator filteredEnd = m_filteredItems.end();
+    while (filteredIt != filteredEnd) {
+        (*filteredIt)->values.clear();
+        ++filteredIt;

     }
 }
 
     }
 }
 


@@ -417,28 +523,62 @@ bool KFileItemModel::setExpanded(int index, bool expanded)
     }
 
     QHash<QByteArray, QVariant> values;
     }
 
     QHash<QByteArray, QVariant> values;

-    values.insert("isExpanded", expanded);
+    values.insert(sharedValue("isExpanded"), expanded);

     if (!setData(index, values)) {
         return false;
     }
 
     if (!setData(index, values)) {
         return false;
     }
 

-    const KUrl url = m_itemData.at(index)->item.url();
+    const KFileItem item = m_itemData.at(index)->item;
+    const QUrl url = item.url();
+    const QUrl targetUrl = item.targetUrl();

     if (expanded) {
     if (expanded) {

-        m_expandedDirs.insert(url);
+        m_expandedDirs.insert(targetUrl, url);

         m_dirLister->openUrl(url, KDirLister::Keep);
         m_dirLister->openUrl(url, KDirLister::Keep);

+
+        const QVariantList previouslyExpandedChildren = m_itemData.at(index)->values.value("previouslyExpandedChildren").value<QVariantList>();
+        foreach (const QVariant& var, previouslyExpandedChildren) {
+            m_urlsToExpand.insert(var.toUrl());
+        }

     } else {
     } else {

-        m_expandedDirs.remove(url);
-        m_dirLister->stop(url);
+        // Note that there might be (indirect) children of the folder which is to be collapsed in
+        // m_pendingItemsToInsert. To prevent that they will be inserted into the model later,
+        // possibly without a parent, which might result in a crash, we insert all pending items
+        // right now. All new items which would be without a parent will then be removed.
+        dispatchPendingItemsToInsert();
+
+        // Check if the index of the collapsed folder has changed. If that is the case, then items
+        // were inserted before the collapsed folder, and its index needs to be updated.
+        if (m_itemData.at(index)->item != item) {
+            index = this->index(item);
+        }

 
 

+        m_expandedDirs.remove(targetUrl);
+        m_dirLister->stop(url);

 
 

-        KFileItemList itemsToRemove;
-        const int expandedParentsCount = data(index)["expandedParentsCount"].toInt();
-        ++index;
-        while (index < count() && data(index)["expandedParentsCount"].toInt() > expandedParentsCount) {
-            itemsToRemove.append(m_itemData.at(index)->item);
-            ++index;
+        const int parentLevel = expandedParentsCount(index);
+        const int itemCount = m_itemData.count();
+        const int firstChildIndex = index + 1;
+
+        QVariantList expandedChildren;
+
+        int childIndex = firstChildIndex;
+        while (childIndex < itemCount && expandedParentsCount(childIndex) > parentLevel) {
+            ItemData* itemData = m_itemData.at(childIndex);
+            if (itemData->values.value("isExpanded").toBool()) {
+                const QUrl targetUrl = itemData->item.targetUrl();
+                const QUrl url = itemData->item.url();
+                m_expandedDirs.remove(targetUrl);
+                m_dirLister->stop(url);     // TODO: try to unit-test this, see https://bugs.kde.org/show_bug.cgi?id=332102#c11
+                expandedChildren.append(targetUrl);
+            }
+            ++childIndex;

         }
         }

-        removeItems(itemsToRemove);
+        const int childrenCount = childIndex - firstChildIndex;
+
+        removeFilteredChildren(KItemRangeList() << KItemRange(index, 1 + childrenCount));
+        removeItems(KItemRangeList() << KItemRange(firstChildIndex, childrenCount), DeleteItemData);
+
+        m_itemData.at(index)->values.insert("previouslyExpandedChildren", expandedChildren);

     }
 
     return true;
     }
 
     return true;


@@ -455,7 +595,9 @@ bool KFileItemModel::isExpanded(int index) const
 bool KFileItemModel::isExpandable(int index) const
 {
     if (index >= 0 && index < count()) {
 bool KFileItemModel::isExpandable(int index) const
 {
     if (index >= 0 && index < count()) {

-        return m_itemData.at(index)->values.value("isExpandable").toBool();
+        // Call data (instead of accessing m_itemData directly)
+        // to ensure that the value is initialized.
+        return data(index).value("isExpandable").toBool();

     }
     return false;
 }
     }
     return false;
 }


@@ -463,43 +605,53 @@ bool KFileItemModel::isExpandable(int index) const
 int KFileItemModel::expandedParentsCount(int index) const
 {
     if (index >= 0 && index < count()) {
 int KFileItemModel::expandedParentsCount(int index) const
 {
     if (index >= 0 && index < count()) {

-        const int parentsCount = m_itemData.at(index)->values.value("expandedParentsCount").toInt();
-        if (parentsCount > 0) {
-            return parentsCount;
-        }
+        return expandedParentsCount(m_itemData.at(index));

     }
     return 0;
 }
 
     }
     return 0;
 }
 

-QSet<KUrl> KFileItemModel::expandedDirectories() const
+QSet<QUrl> KFileItemModel::expandedDirectories() const

 {
 {

-    return m_expandedDirs;
+    QSet<QUrl> result;
+    const auto dirs = m_expandedDirs;
+    for (const auto &dir : dirs) {
+        result.insert(dir);
+    }
+    return result;

 }
 
 }
 

-void KFileItemModel::restoreExpandedDirectories(const QSet<KUrl>& urls)
+void KFileItemModel::restoreExpandedDirectories(const QSet<QUrl> &urls)

 {
     m_urlsToExpand = urls;
 }
 
 {
     m_urlsToExpand = urls;
 }
 

-void KFileItemModel::expandParentDirectories(const KUrl& url)
+void KFileItemModel::expandParentDirectories(const QUrl &url)

 {
 {

-    const int pos = m_dirLister->url().path().length();

 
     // Assure that each sub-path of the URL that should be
     // expanded is added to m_urlsToExpand. KDirLister
     // does not care whether the parent-URL has already been
     // expanded.
 
     // Assure that each sub-path of the URL that should be
     // expanded is added to m_urlsToExpand. KDirLister
     // does not care whether the parent-URL has already been
     // expanded.

-    KUrl urlToExpand = m_dirLister->url();
-    const QStringList subDirs = url.path().mid(pos).split(QDir::separator());
+    QUrl urlToExpand = m_dirLister->url();
+    const int pos = urlToExpand.path().length();
+
+    // first subdir can be empty, if m_dirLister->url().path() does not end with '/'
+    // this happens if baseUrl is not root but a home directory, see FoldersPanel,
+    // so using QString::SkipEmptyParts
+    const QStringList subDirs = url.path().mid(pos).split(QDir::separator(), QString::SkipEmptyParts);

     for (int i = 0; i < subDirs.count() - 1; ++i) {
     for (int i = 0; i < subDirs.count() - 1; ++i) {

-        urlToExpand.addPath(subDirs.at(i));
+        QString path = urlToExpand.path();
+        if (!path.endsWith(QLatin1Char('/'))) {
+            path.append(QLatin1Char('/'));
+        }
+        urlToExpand.setPath(path + subDirs.at(i));

         m_urlsToExpand.insert(urlToExpand);
     }
 
     // KDirLister::open() must called at least once to trigger an initial
     // loading. The pending URLs that must be restored are handled
     // in slotCompleted().
         m_urlsToExpand.insert(urlToExpand);
     }
 
     // KDirLister::open() must called at least once to trigger an initial
     // loading. The pending URLs that must be restored are handled
     // in slotCompleted().

-    QSetIterator<KUrl> it2(m_urlsToExpand);
+    QSetIterator<QUrl> it2(m_urlsToExpand);

     while (it2.hasNext()) {
         const int idx = index(it2.next());
         if (idx >= 0 && !isExpanded(idx)) {
     while (it2.hasNext()) {
         const int idx = index(it2.next());
         if (idx >= 0 && !isExpanded(idx)) {


@@ -542,37 +694,69 @@ void KFileItemModel::applyFilters()
 {
     // Check which shown items from m_itemData must get
     // hidden and hence moved to m_filteredItems.
 {
     // Check which shown items from m_itemData must get
     // hidden and hence moved to m_filteredItems.

-    KFileItemList newFilteredItems;
+    QVector<int> newFilteredIndexes;
+
+    const int itemCount = m_itemData.count();
+    for (int index = 0; index < itemCount; ++index) {
+        ItemData* itemData = m_itemData.at(index);

 
 

-    foreach (ItemData* itemData, m_itemData) {

         // Only filter non-expanded items as child items may never
         // exist without a parent item
         if (!itemData->values.value("isExpanded").toBool()) {
         // Only filter non-expanded items as child items may never
         // exist without a parent item
         if (!itemData->values.value("isExpanded").toBool()) {

-            if (!m_filter.matches(itemData->item)) {
-                newFilteredItems.append(itemData->item);
-                m_filteredItems.insert(itemData->item);
+            const KFileItem item = itemData->item;
+            if (!m_filter.matches(item)) {
+                newFilteredIndexes.append(index);
+                m_filteredItems.insert(item, itemData);

             }
         }
     }
 
             }
         }
     }
 

-    removeItems(newFilteredItems);
+    const KItemRangeList removedRanges = KItemRangeList::fromSortedContainer(newFilteredIndexes);
+    removeItems(removedRanges, KeepItemData);

 
     // Check which hidden items from m_filteredItems should
     // get visible again and hence removed from m_filteredItems.
 
     // Check which hidden items from m_filteredItems should
     // get visible again and hence removed from m_filteredItems.

-    KFileItemList newVisibleItems;
+    QList<ItemData*> newVisibleItems;

 
 

-    QMutableSetIterator<KFileItem> it(m_filteredItems);
-    while (it.hasNext()) {
-        const KFileItem item = it.next();
-        if (m_filter.matches(item)) {
-            newVisibleItems.append(item);
-            it.remove();
+    QHash<KFileItem, ItemData*>::iterator it = m_filteredItems.begin();
+    while (it != m_filteredItems.end()) {
+        if (m_filter.matches(it.key())) {
+            newVisibleItems.append(it.value());
+            it = m_filteredItems.erase(it);
+        } else {
+            ++it;

         }
     }
 
     insertItems(newVisibleItems);
 }
 
         }
     }
 
     insertItems(newVisibleItems);
 }
 

+void KFileItemModel::removeFilteredChildren(const KItemRangeList& itemRanges)
+{
+    if (m_filteredItems.isEmpty() || !m_requestRole[ExpandedParentsCountRole]) {
+        // There are either no filtered items, or it is not possible to expand
+        // folders -> there cannot be any filtered children.
+        return;
+    }
+
+    QSet<ItemData*> parents;
+    foreach (const KItemRange& range, itemRanges) {
+        for (int index = range.index; index < range.index + range.count; ++index) {
+            parents.insert(m_itemData.at(index));
+        }
+    }
+
+    QHash<KFileItem, ItemData*>::iterator it = m_filteredItems.begin();
+    while (it != m_filteredItems.end()) {
+        if (parents.contains(it.value()->parent)) {
+            delete it.value();
+            it = m_filteredItems.erase(it);
+        } else {
+            ++it;
+        }
+    }
+}
+

 QList<KFileItemModel::RoleInfo> KFileItemModel::rolesInformation()
 {
     static QList<RoleInfo> rolesInfo;
 QList<KFileItemModel::RoleInfo> KFileItemModel::rolesInformation()
 {
     static QList<RoleInfo> rolesInfo;


@@ -592,7 +776,7 @@ QList<KFileItemModel::RoleInfo> KFileItemModel::rolesInformation()
                     // menus tries to put the actions into sub menus otherwise.
                     info.group = QString();
                 }
                     // menus tries to put the actions into sub menus otherwise.
                     info.group = QString();
                 }

-                info.requiresNepomuk = map[i].requiresNepomuk;
+                info.requiresBaloo = map[i].requiresBaloo;

                 info.requiresIndexer = map[i].requiresIndexer;
                 rolesInfo.append(info);
             }
                 info.requiresIndexer = map[i].requiresIndexer;
                 rolesInfo.append(info);
             }


@@ -613,11 +797,11 @@ void KFileItemModel::onSortRoleChanged(const QByteArray& current, const QByteArr
     Q_UNUSED(previous);
     m_sortRole = typeForRole(current);
 
     Q_UNUSED(previous);
     m_sortRole = typeForRole(current);
 

-#ifdef KFILEITEMMODEL_DEBUG

     if (!m_requestRole[m_sortRole]) {
     if (!m_requestRole[m_sortRole]) {

-        kWarning() << "The sort-role has been changed to a role that has not been received yet";
+        QSet<QByteArray> newRoles = m_roles;
+        newRoles << current;
+        setRoles(newRoles);

     }
     }

-#endif

 
     resortAllItems();
 }
 
     resortAllItems();
 }


@@ -629,6 +813,27 @@ void KFileItemModel::onSortOrderChanged(Qt::SortOrder current, Qt::SortOrder pre
     resortAllItems();
 }
 
     resortAllItems();
 }
 

+void KFileItemModel::loadSortingSettings()
+{
+    using Choice = GeneralSettings::EnumSortingChoice;
+    switch (GeneralSettings::sortingChoice()) {
+    case Choice::NaturalSorting:
+        m_naturalSorting = true;
+        m_collator.setCaseSensitivity(Qt::CaseInsensitive);
+        break;
+    case Choice::CaseSensitiveSorting:
+        m_naturalSorting = false;
+        m_collator.setCaseSensitivity(Qt::CaseSensitive);
+        break;
+    case Choice::CaseInsensitiveSorting:
+        m_naturalSorting = false;
+        m_collator.setCaseSensitivity(Qt::CaseInsensitive);
+        break;
+    default:
+        Q_UNREACHABLE();
+    }
+}
+

 void KFileItemModel::resortAllItems()
 {
     m_resortAllItemsTimer->stop();
 void KFileItemModel::resortAllItems()
 {
     m_resortAllItemsTimer->stop();


@@ -641,45 +846,70 @@ void KFileItemModel::resortAllItems()
 #ifdef KFILEITEMMODEL_DEBUG
     QElapsedTimer timer;
     timer.start();
 #ifdef KFILEITEMMODEL_DEBUG
     QElapsedTimer timer;
     timer.start();

-    kDebug() << "===========================================================";
-    kDebug() << "Resorting" << itemCount << "items";
+    qCDebug(DolphinDebug) << "===========================================================";
+    qCDebug(DolphinDebug) << "Resorting" << itemCount << "items";

 #endif
 
     // Remember the order of the current URLs so
     // that it can be determined which indexes have
     // been moved because of the resorting.
 #endif
 
     // Remember the order of the current URLs so
     // that it can be determined which indexes have
     // been moved because of the resorting.

-    QList<KUrl> oldUrls;
+    QList<QUrl> oldUrls;

     oldUrls.reserve(itemCount);
     foreach (const ItemData* itemData, m_itemData) {
         oldUrls.append(itemData->item.url());
     }
 
     oldUrls.reserve(itemCount);
     foreach (const ItemData* itemData, m_itemData) {
         oldUrls.append(itemData->item.url());
     }
 

-    m_groups.clear();

     m_items.clear();
     m_items.clear();

+    m_items.reserve(itemCount);

 
     // Resort the items
 
     // Resort the items

-    KFileItemModelSortAlgorithm::sort(this, m_itemData.begin(), m_itemData.end());
+    sort(m_itemData.begin(), m_itemData.end());

     for (int i = 0; i < itemCount; ++i) {
         m_items.insert(m_itemData.at(i)->item.url(), i);
     }
 
     for (int i = 0; i < itemCount; ++i) {
         m_items.insert(m_itemData.at(i)->item.url(), i);
     }
 

-    // Determine the indexes that have been moved
-    QList<int> movedToIndexes;
-    movedToIndexes.reserve(itemCount);
-    for (int i = 0; i < itemCount; i++) {
-        const int newIndex = m_items.value(oldUrls.at(i).url());
-        movedToIndexes.append(newIndex);
+    // Determine the first index that has been moved.
+    int firstMovedIndex = 0;
+    while (firstMovedIndex < itemCount
+           && firstMovedIndex == m_items.value(oldUrls.at(firstMovedIndex))) {
+        ++firstMovedIndex;

     }
 
     }
 

-    // Don't check whether items have really been moved and always emit a
-    // itemsMoved() signal after resorting: In case of grouped items
-    // the groups might change even if the items themselves don't change their
-    // position. Let the receiver of the signal decide whether a check for moved
-    // items makes sense.
-    emit itemsMoved(KItemRange(0, itemCount), movedToIndexes);
+    const bool itemsHaveMoved = firstMovedIndex < itemCount;
+    if (itemsHaveMoved) {
+        m_groups.clear();
+
+        int lastMovedIndex = itemCount - 1;
+        while (lastMovedIndex > firstMovedIndex
+               && lastMovedIndex == m_items.value(oldUrls.at(lastMovedIndex))) {
+            --lastMovedIndex;
+        }
+
+        Q_ASSERT(firstMovedIndex <= lastMovedIndex);
+
+        // Create a list movedToIndexes, which has the property that
+        // movedToIndexes[i] is the new index of the item with the old index
+        // firstMovedIndex + i.
+        const int movedItemsCount = lastMovedIndex - firstMovedIndex + 1;
+        QList<int> movedToIndexes;
+        movedToIndexes.reserve(movedItemsCount);
+        for (int i = firstMovedIndex; i <= lastMovedIndex; ++i) {
+            const int newIndex = m_items.value(oldUrls.at(i));
+            movedToIndexes.append(newIndex);
+        }
+
+        emit itemsMoved(KItemRange(firstMovedIndex, movedItemsCount), movedToIndexes);
+    } else if (groupedSorting()) {
+        // The groups might have changed even if the order of the items has not.
+        const QList<QPair<int, QVariant> > oldGroups = m_groups;
+        m_groups.clear();
+        if (groups() != oldGroups) {
+            emit groupsChanged();
+        }
+    }

 
 #ifdef KFILEITEMMODEL_DEBUG
 
 #ifdef KFILEITEMMODEL_DEBUG

-    kDebug() << "[TIME] Resorting of" << itemCount << "items:" << timer.elapsed();
+    qCDebug(DolphinDebug) << "[TIME] Resorting of" << itemCount << "items:" << timer.elapsed();

 #endif
 }
 
 #endif
 }
 


@@ -692,11 +922,11 @@ void KFileItemModel::slotCompleted()
         // Note that the parent folder must be expanded before any of its subfolders become visible.
         // Therefore, some URLs in m_restoredExpandedUrls might not be visible yet
         // -> we expand the first visible URL we find in m_restoredExpandedUrls.
         // Note that the parent folder must be expanded before any of its subfolders become visible.
         // Therefore, some URLs in m_restoredExpandedUrls might not be visible yet
         // -> we expand the first visible URL we find in m_restoredExpandedUrls.

-        foreach (const KUrl& url, m_urlsToExpand) {
-            const int index = m_items.value(url, -1);
-            if (index >= 0) {
+        foreach (const QUrl& url, m_urlsToExpand) {
+            const int indexForUrl = index(url);
+            if (indexForUrl >= 0) {

                 m_urlsToExpand.remove(url);
                 m_urlsToExpand.remove(url);

-                if (setExpanded(index, true)) {
+                if (setExpanded(indexForUrl, true)) {

                     // The dir lister has been triggered. This slot will be called
                     // again after the directory has been expanded.
                     return;
                     // The dir lister has been triggered. This slot will be called
                     // again after the directory has been expanded.
                     return;


@@ -720,56 +950,59 @@ void KFileItemModel::slotCanceled()
     emit directoryLoadingCanceled();
 }
 
     emit directoryLoadingCanceled();
 }
 

-void KFileItemModel::slotNewItems(const KFileItemList& items)
+void KFileItemModel::slotItemsAdded(const QUrl &directoryUrl, const KFileItemList& items)

 {
     Q_ASSERT(!items.isEmpty());
 
 {
     Q_ASSERT(!items.isEmpty());
 

-    if (m_requestRole[ExpandedParentsCountRole] && m_expandedParentsCountRoot >= 0) {
-        // To be able to compare whether the new items may be inserted as children
-        // of a parent item the pending items must be added to the model first.
-        dispatchPendingItemsToInsert();
-
-        KFileItem item = items.first();
+    QUrl parentUrl;
+    if (m_expandedDirs.contains(directoryUrl)) {
+        parentUrl = m_expandedDirs.value(directoryUrl);
+    } else {
+        parentUrl = directoryUrl.adjusted(QUrl::StripTrailingSlash);
+    }

 
 

+    if (m_requestRole[ExpandedParentsCountRole]) {

         // If the expanding of items is enabled, the call
         // dirLister->openUrl(url, KDirLister::Keep) in KFileItemModel::setExpanded()
         // might result in emitting the same items twice due to the Keep-parameter.
         // This case happens if an item gets expanded, collapsed and expanded again
         // before the items could be loaded for the first expansion.
         // If the expanding of items is enabled, the call
         // dirLister->openUrl(url, KDirLister::Keep) in KFileItemModel::setExpanded()
         // might result in emitting the same items twice due to the Keep-parameter.
         // This case happens if an item gets expanded, collapsed and expanded again
         // before the items could be loaded for the first expansion.

-        const int index = m_items.value(item.url(), -1);
-        if (index >= 0) {
+        if (index(items.first().url()) >= 0) {

             // The items are already part of the model.
             return;
         }
 
             // The items are already part of the model.
             return;
         }
 

+        if (directoryUrl != directory()) {
+            // To be able to compare whether the new items may be inserted as children
+            // of a parent item the pending items must be added to the model first.
+            dispatchPendingItemsToInsert();
+        }
+

         // KDirLister keeps the children of items that got expanded once even if
         // they got collapsed again with KFileItemModel::setExpanded(false). So it must be
         // checked whether the parent for new items is still expanded.
         // KDirLister keeps the children of items that got expanded once even if
         // they got collapsed again with KFileItemModel::setExpanded(false). So it must be
         // checked whether the parent for new items is still expanded.

-        KUrl parentUrl = item.url().upUrl();
-        parentUrl.adjustPath(KUrl::RemoveTrailingSlash);
-        const int parentIndex = m_items.value(parentUrl, -1);
+        const int parentIndex = index(parentUrl);

         if (parentIndex >= 0 && !m_itemData[parentIndex]->values.value("isExpanded").toBool()) {
             // The parent is not expanded.
             return;
         }
     }
 
         if (parentIndex >= 0 && !m_itemData[parentIndex]->values.value("isExpanded").toBool()) {
             // The parent is not expanded.
             return;
         }
     }
 

+    QList<ItemData*> itemDataList = createItemDataList(parentUrl, items);
+

     if (!m_filter.hasSetFilters()) {
     if (!m_filter.hasSetFilters()) {

-        m_pendingItemsToInsert.append(items);
+        m_pendingItemsToInsert.append(itemDataList);

     } else {
         // The name or type filter is active. Hide filtered items
         // before inserting them into the model and remember
         // the filtered items in m_filteredItems.
     } else {
         // The name or type filter is active. Hide filtered items
         // before inserting them into the model and remember
         // the filtered items in m_filteredItems.

-        KFileItemList filteredItems;
-        foreach (const KFileItem& item, items) {
-            if (m_filter.matches(item)) {
-                filteredItems.append(item);
+        foreach (ItemData* itemData, itemDataList) {
+            if (m_filter.matches(itemData->item)) {
+                m_pendingItemsToInsert.append(itemData);

             } else {
             } else {

-                m_filteredItems.insert(item);
+                m_filteredItems.insert(itemData->item, itemData);

             }
         }
             }
         }

-
-        m_pendingItemsToInsert.append(filteredItems);

     }
 
     if (useMaximumUpdateInterval() && !m_maximumUpdateIntervalTimer->isActive()) {
     }
 
     if (useMaximumUpdateInterval() && !m_maximumUpdateIntervalTimer->isActive()) {


@@ -783,83 +1016,102 @@ void KFileItemModel::slotItemsDeleted(const KFileItemList& items)
 {
     dispatchPendingItemsToInsert();
 
 {
     dispatchPendingItemsToInsert();
 

-    KFileItemList itemsToRemove = items;
-    if (m_requestRole[ExpandedParentsCountRole] && m_expandedParentsCountRoot >= 0) {
-        // Assure that removing a parent item also results in removing all children
-        foreach (const KFileItem& item, items) {
-            itemsToRemove.append(childItems(item));
-        }
-    }
-
-    if (!m_filteredItems.isEmpty()) {
-        foreach (const KFileItem& item, itemsToRemove) {
-            m_filteredItems.remove(item);
-        }
+    QVector<int> indexesToRemove;
+    indexesToRemove.reserve(items.count());

 
 

-        if (m_requestRole[ExpandedParentsCountRole] && m_expandedParentsCountRoot >= 0) {
-            // Remove all filtered children of deleted items. First, we put the
-            // deleted URLs into a set to provide fast lookup while iterating
-            // over m_filteredItems and prevent quadratic complexity if there
-            // are N removed items and N filtered items.
-            QSet<KUrl> urlsToRemove;
-            urlsToRemove.reserve(itemsToRemove.count());
-            foreach (const KFileItem& item, itemsToRemove) {
-                KUrl url = item.url();
-                url.adjustPath(KUrl::RemoveTrailingSlash);
-                urlsToRemove.insert(url);
+    foreach (const KFileItem& item, items) {
+        const int indexForItem = index(item);
+        if (indexForItem >= 0) {
+            indexesToRemove.append(indexForItem);
+        } else {
+            // Probably the item has been filtered.
+            QHash<KFileItem, ItemData*>::iterator it = m_filteredItems.find(item);
+            if (it != m_filteredItems.end()) {
+                delete it.value();
+                m_filteredItems.erase(it);

             }
             }

+        }
+    }

 
 

-            QSet<KFileItem>::iterator it = m_filteredItems.begin();
-            while (it != m_filteredItems.end()) {
-                const KUrl url = it->url();
-                KUrl parentUrl = url.upUrl();
-                parentUrl.adjustPath(KUrl::RemoveTrailingSlash);
+    std::sort(indexesToRemove.begin(), indexesToRemove.end());

 
 

-                if (urlsToRemove.contains(parentUrl)) {
-                    it = m_filteredItems.erase(it);
-                } else {
-                    ++it;
-                }
+    if (m_requestRole[ExpandedParentsCountRole] && !m_expandedDirs.isEmpty()) {
+        // Assure that removing a parent item also results in removing all children
+        QVector<int> indexesToRemoveWithChildren;
+        indexesToRemoveWithChildren.reserve(m_itemData.count());
+
+        const int itemCount = m_itemData.count();
+        foreach (int index, indexesToRemove) {
+            indexesToRemoveWithChildren.append(index);
+
+            const int parentLevel = expandedParentsCount(index);
+            int childIndex = index + 1;
+            while (childIndex < itemCount && expandedParentsCount(childIndex) > parentLevel) {
+                indexesToRemoveWithChildren.append(childIndex);
+                ++childIndex;

             }
         }
             }
         }

+
+        indexesToRemove = indexesToRemoveWithChildren;

     }
 
     }
 

-    removeItems(itemsToRemove);
+    const KItemRangeList itemRanges = KItemRangeList::fromSortedContainer(indexesToRemove);
+    removeFilteredChildren(itemRanges);
+    removeItems(itemRanges, DeleteItemData);

 }
 
 void KFileItemModel::slotRefreshItems(const QList<QPair<KFileItem, KFileItem> >& items)
 {
     Q_ASSERT(!items.isEmpty());
 #ifdef KFILEITEMMODEL_DEBUG
 }
 
 void KFileItemModel::slotRefreshItems(const QList<QPair<KFileItem, KFileItem> >& items)
 {
     Q_ASSERT(!items.isEmpty());
 #ifdef KFILEITEMMODEL_DEBUG

-    kDebug() << "Refreshing" << items.count() << "items";
+    qCDebug(DolphinDebug) << "Refreshing" << items.count() << "items";

 #endif
 
 #endif
 

-    m_groups.clear();
-

     // Get the indexes of all items that have been refreshed
     QList<int> indexes;
     indexes.reserve(items.count());
 
     // Get the indexes of all items that have been refreshed
     QList<int> indexes;
     indexes.reserve(items.count());
 

+    QSet<QByteArray> changedRoles;
+

     QListIterator<QPair<KFileItem, KFileItem> > it(items);
     while (it.hasNext()) {
         const QPair<KFileItem, KFileItem>& itemPair = it.next();
         const KFileItem& oldItem = itemPair.first;
         const KFileItem& newItem = itemPair.second;
     QListIterator<QPair<KFileItem, KFileItem> > it(items);
     while (it.hasNext()) {
         const QPair<KFileItem, KFileItem>& itemPair = it.next();
         const KFileItem& oldItem = itemPair.first;
         const KFileItem& newItem = itemPair.second;

-        const int index = m_items.value(oldItem.url(), -1);
-        if (index >= 0) {
-            m_itemData[index]->item = newItem;
+        const int indexForItem = index(oldItem);
+        if (indexForItem >= 0) {
+            m_itemData[indexForItem]->item = newItem;

 
             // Keep old values as long as possible if they could not retrieved synchronously yet.
             // The update of the values will be done asynchronously by KFileItemModelRolesUpdater.
 
             // Keep old values as long as possible if they could not retrieved synchronously yet.
             // The update of the values will be done asynchronously by KFileItemModelRolesUpdater.

-            QHashIterator<QByteArray, QVariant> it(retrieveData(newItem));
+            QHashIterator<QByteArray, QVariant> it(retrieveData(newItem, m_itemData.at(indexForItem)->parent));
+            QHash<QByteArray, QVariant>& values = m_itemData[indexForItem]->values;

             while (it.hasNext()) {
                 it.next();
             while (it.hasNext()) {
                 it.next();

-                m_itemData[index]->values.insert(it.key(), it.value());
+                const QByteArray& role = it.key();
+                if (values.value(role) != it.value()) {
+                    values.insert(role, it.value());
+                    changedRoles.insert(role);
+                }

             }
 
             m_items.remove(oldItem.url());
             }
 
             m_items.remove(oldItem.url());

-            m_items.insert(newItem.url(), index);
-            indexes.append(index);
+            m_items.insert(newItem.url(), indexForItem);
+            indexes.append(indexForItem);
+        } else {
+            // Check if 'oldItem' is one of the filtered items.
+            QHash<KFileItem, ItemData*>::iterator it = m_filteredItems.find(oldItem);
+            if (it != m_filteredItems.end()) {
+                ItemData* itemData = it.value();
+                itemData->item = newItem;
+
+                // The data stored in 'values' might have changed. Therefore, we clear
+                // 'values' and re-populate it the next time it is requested via data(int).
+                itemData->values.clear();
+
+                m_filteredItems.erase(it);
+                m_filteredItems.insert(newItem, itemData);
+            }

         }
     }
 
         }
     }
 


@@ -871,49 +1123,25 @@ void KFileItemModel::slotRefreshItems(const QList<QPair<KFileItem, KFileItem> >&
 
     // Extract the item-ranges out of the changed indexes
     qSort(indexes);
 
     // Extract the item-ranges out of the changed indexes
     qSort(indexes);

-
-    KItemRangeList itemRangeList;
-    int previousIndex = indexes.at(0);
-    int rangeIndex = previousIndex;
-    int rangeCount = 1;
-
-    const int maxIndex = indexes.count() - 1;
-    for (int i = 1; i <= maxIndex; ++i) {
-        const int currentIndex = indexes.at(i);
-        if (currentIndex == previousIndex + 1) {
-            ++rangeCount;
-        } else {
-            itemRangeList.append(KItemRange(rangeIndex, rangeCount));
-
-            rangeIndex = currentIndex;
-            rangeCount = 1;
-        }
-        previousIndex = currentIndex;
-    }
-
-    if (rangeCount > 0) {
-        itemRangeList.append(KItemRange(rangeIndex, rangeCount));
-    }
-
-    emit itemsChanged(itemRangeList, m_roles);
-
-    resortAllItems();
+    const KItemRangeList itemRangeList = KItemRangeList::fromSortedContainer(indexes);
+    emitItemsChangedAndTriggerResorting(itemRangeList, changedRoles);

 }
 
 void KFileItemModel::slotClear()
 {
 #ifdef KFILEITEMMODEL_DEBUG
 }
 
 void KFileItemModel::slotClear()
 {
 #ifdef KFILEITEMMODEL_DEBUG

-    kDebug() << "Clearing all items";
+    qCDebug(DolphinDebug) << "Clearing all items";

 #endif
 
 #endif
 

+    qDeleteAll(m_filteredItems);

     m_filteredItems.clear();
     m_groups.clear();
 
     m_maximumUpdateIntervalTimer->stop();
     m_resortAllItemsTimer->stop();
     m_filteredItems.clear();
     m_groups.clear();
 
     m_maximumUpdateIntervalTimer->stop();
     m_resortAllItemsTimer->stop();

-    m_pendingItemsToInsert.clear();

 
 

-    m_expandedParentsCountRoot = UninitializedExpandedParentsCountRoot;
+    qDeleteAll(m_pendingItemsToInsert);
+    m_pendingItemsToInsert.clear();

 
     const int removedCount = m_itemData.count();
     if (removedCount > 0) {
 
     const int removedCount = m_itemData.count();
     if (removedCount > 0) {


@@ -926,14 +1154,9 @@ void KFileItemModel::slotClear()
     m_expandedDirs.clear();
 }
 
     m_expandedDirs.clear();
 }
 

-void KFileItemModel::slotClear(const KUrl& url)
-{
-    Q_UNUSED(url);
-}
-
-void KFileItemModel::slotNaturalSortingChanged()
+void KFileItemModel::slotSortingChoiceChanged()

 {
 {

-    m_naturalSorting = KGlobalSettings::naturalSorting();
+    loadSortingSettings();

     resortAllItems();
 }
 
     resortAllItems();
 }
 


@@ -945,221 +1168,311 @@ void KFileItemModel::dispatchPendingItemsToInsert()
     }
 }
 
     }
 }
 

-void KFileItemModel::insertItems(const KFileItemList& items)
+void KFileItemModel::insertItems(QList<ItemData*>& newItems)

 {
 {

-    if (items.isEmpty()) {
+    if (newItems.isEmpty()) {

         return;
     }
 
         return;
     }
 

-    if (m_sortRole == TypeRole) {
-        // Try to resolve the MIME-types synchronously to prevent a reordering of
-        // the items when sorting by type (per default MIME-types are resolved
-        // asynchronously by KFileItemModelRolesUpdater).
-        determineMimeTypes(items, 200);
-    }
-

 #ifdef KFILEITEMMODEL_DEBUG
     QElapsedTimer timer;
     timer.start();
 #ifdef KFILEITEMMODEL_DEBUG
     QElapsedTimer timer;
     timer.start();

-    kDebug() << "===========================================================";
-    kDebug() << "Inserting" << items.count() << "items";
+    qCDebug(DolphinDebug) << "===========================================================";
+    qCDebug(DolphinDebug) << "Inserting" << newItems.count() << "items";

 #endif
 
     m_groups.clear();
 #endif
 
     m_groups.clear();

+    prepareItemsForSorting(newItems);
+
+    if (m_sortRole == NameRole && m_naturalSorting) {
+        // Natural sorting of items can be very slow. However, it becomes much
+        // faster if the input sequence is already mostly sorted. Therefore, we
+        // first sort 'newItems' according to the QStrings returned by
+        // KFileItem::text() using QString::operator<(), which is quite fast.
+        parallelMergeSort(newItems.begin(), newItems.end(), nameLessThan, QThread::idealThreadCount());
+    }

 
 

-    QList<ItemData*> sortedItems = createItemDataList(items);
-    KFileItemModelSortAlgorithm::sort(this, sortedItems.begin(), sortedItems.end());
+    sort(newItems.begin(), newItems.end());

 
 #ifdef KFILEITEMMODEL_DEBUG
 
 #ifdef KFILEITEMMODEL_DEBUG

-    kDebug() << "[TIME] Sorting:" << timer.elapsed();
+    qCDebug(DolphinDebug) << "[TIME] Sorting:" << timer.elapsed();

 #endif
 
     KItemRangeList itemRanges;
 #endif
 
     KItemRangeList itemRanges;

-    int targetIndex = 0;
-    int sourceIndex = 0;
-    int insertedAtIndex = -1;        // Index for the current item-range
-    int insertedCount = 0;           // Count for the current item-range
-    int previouslyInsertedCount = 0; // Sum of previously inserted items for all ranges
-    while (sourceIndex < sortedItems.count()) {
-        // Find target index from m_items to insert the current item
-        // in a sorted order
-        const int previousTargetIndex = targetIndex;
-        while (targetIndex < m_itemData.count()) {
-            if (!lessThan(m_itemData.at(targetIndex), sortedItems.at(sourceIndex))) {
-                break;
+    const int existingItemCount = m_itemData.count();
+    const int newItemCount = newItems.count();
+    const int totalItemCount = existingItemCount + newItemCount;
+
+    if (existingItemCount == 0) {
+        // Optimization for the common special case that there are no
+        // items in the model yet. Happens, e.g., when entering a folder.
+        m_itemData = newItems;
+        itemRanges << KItemRange(0, newItemCount);
+    } else {
+        m_itemData.reserve(totalItemCount);
+        for (int i = existingItemCount; i < totalItemCount; ++i) {
+            m_itemData.append(0);
+        }
+
+        // We build the new list m_itemData in reverse order to minimize
+        // the number of moves and guarantee O(N) complexity.
+        int targetIndex = totalItemCount - 1;
+        int sourceIndexExistingItems = existingItemCount - 1;
+        int sourceIndexNewItems = newItemCount - 1;
+
+        int rangeCount = 0;
+
+        while (sourceIndexNewItems >= 0) {
+            ItemData* newItem = newItems.at(sourceIndexNewItems);
+            if (sourceIndexExistingItems >= 0 && lessThan(newItem, m_itemData.at(sourceIndexExistingItems), m_collator)) {
+                // Move an existing item to its new position. If any new items
+                // are behind it, push the item range to itemRanges.
+                if (rangeCount > 0) {
+                    itemRanges << KItemRange(sourceIndexExistingItems + 1, rangeCount);
+                    rangeCount = 0;
+                }
+
+                m_itemData[targetIndex] = m_itemData.at(sourceIndexExistingItems);
+                --sourceIndexExistingItems;
+            } else {
+                // Insert a new item into the list.
+                ++rangeCount;
+                m_itemData[targetIndex] = newItem;
+                --sourceIndexNewItems;

             }
             }

-            ++targetIndex;
+            --targetIndex;

         }
 
         }
 

-        if (targetIndex - previousTargetIndex > 0 && insertedAtIndex >= 0) {
-            itemRanges << KItemRange(insertedAtIndex, insertedCount);
-            previouslyInsertedCount += insertedCount;
-            insertedAtIndex = targetIndex - previouslyInsertedCount;
-            insertedCount = 0;
+        // Push the final item range to itemRanges.
+        if (rangeCount > 0) {
+            itemRanges << KItemRange(sourceIndexExistingItems + 1, rangeCount);

         }
 
         }
 

-        // Insert item at the position targetIndex by transferring
-        // the ownership of the item-data from sortedItems to m_itemData.
-        // m_items will be inserted after the loop (see comment below)
-        m_itemData.insert(targetIndex, sortedItems.at(sourceIndex));
-        ++insertedCount;
-
-        if (insertedAtIndex < 0) {
-            insertedAtIndex = targetIndex;
-            Q_ASSERT(previouslyInsertedCount == 0);
-        }
-        ++targetIndex;
-        ++sourceIndex;
+        // Note that itemRanges is still sorted in reverse order.
+        std::reverse(itemRanges.begin(), itemRanges.end());

     }
 
     }
 

-    // The indexes of all m_items must be adjusted, not only the index
-    // of the new items
-    const int itemDataCount = m_itemData.count();
-    for (int i = 0; i < itemDataCount; ++i) {
-        m_items.insert(m_itemData.at(i)->item.url(), i);
-    }
+    // The indexes in m_items are not correct anymore. Therefore, we clear m_items.
+    // It will be re-populated with the updated indices if index(const QUrl&) is called.
+    m_items.clear();

 
 

-    itemRanges << KItemRange(insertedAtIndex, insertedCount);

     emit itemsInserted(itemRanges);
 
 #ifdef KFILEITEMMODEL_DEBUG
     emit itemsInserted(itemRanges);
 
 #ifdef KFILEITEMMODEL_DEBUG

-    kDebug() << "[TIME] Inserting of" << items.count() << "items:" << timer.elapsed();
+    qCDebug(DolphinDebug) << "[TIME] Inserting of" << newItems.count() << "items:" << timer.elapsed();

 #endif
 }
 
 #endif
 }
 

-void KFileItemModel::removeItems(const KFileItemList& items)
+void KFileItemModel::removeItems(const KItemRangeList& itemRanges, RemoveItemsBehavior behavior)

 {
 {

-    if (items.isEmpty()) {
+    if (itemRanges.isEmpty()) {

         return;
     }
 
         return;
     }
 

-#ifdef KFILEITEMMODEL_DEBUG
-    kDebug() << "Removing " << items.count() << "items";
-#endif
-

     m_groups.clear();
 
     m_groups.clear();
 

-    QList<ItemData*> sortedItems;
-    sortedItems.reserve(items.count());
-    foreach (const KFileItem& item, items) {
-        const int index = m_items.value(item.url(), -1);
-        if (index >= 0) {
-            sortedItems.append(m_itemData.at(index));
-        }
-    }
-    KFileItemModelSortAlgorithm::sort(this, sortedItems.begin(), sortedItems.end());
+    // Step 1: Remove the items from m_itemData, and free the ItemData.
+    int removedItemsCount = 0;
+    foreach (const KItemRange& range, itemRanges) {
+        removedItemsCount += range.count;

 
 

-    QList<int> indexesToRemove;
-    indexesToRemove.reserve(items.count());
-
-    // Calculate the item ranges that will get deleted
-    KItemRangeList itemRanges;
-    int removedAtIndex = -1;
-    int removedCount = 0;
-    int targetIndex = 0;
-    foreach (const ItemData* itemData, sortedItems) {
-        const KFileItem& itemToRemove = itemData->item;
-
-        const int previousTargetIndex = targetIndex;
-        while (targetIndex < m_itemData.count()) {
-            if (m_itemData.at(targetIndex)->item.url() == itemToRemove.url()) {
-                break;
+        for (int index = range.index; index < range.index + range.count; ++index) {
+            if (behavior == DeleteItemData) {
+                delete m_itemData.at(index);

             }
             }

-            ++targetIndex;
-        }
-        if (targetIndex >= m_itemData.count()) {
-            kWarning() << "Item that should be deleted has not been found!";
-            return;
-        }

 
 

-        if (targetIndex - previousTargetIndex > 0 && removedAtIndex >= 0) {
-            itemRanges << KItemRange(removedAtIndex, removedCount);
-            removedAtIndex = targetIndex;
-            removedCount = 0;
+            m_itemData[index] = 0;

         }
         }

-
-        indexesToRemove.append(targetIndex);
-        if (removedAtIndex < 0) {
-            removedAtIndex = targetIndex;
-        }
-        ++removedCount;
-        ++targetIndex;

     }
 
     }
 

-    // Delete the items
-    for (int i = indexesToRemove.count() - 1; i >= 0; --i) {
-        const int indexToRemove = indexesToRemove.at(i);
-        ItemData* data = m_itemData.at(indexToRemove);
+    // Step 2: Remove the ItemData pointers from the list m_itemData.
+    int target = itemRanges.at(0).index;
+    int source = itemRanges.at(0).index + itemRanges.at(0).count;
+    int nextRange = 1;

 
 

-        m_items.remove(data->item.url());
+    const int oldItemDataCount = m_itemData.count();
+    while (source < oldItemDataCount) {
+        m_itemData[target] = m_itemData[source];
+        ++target;
+        ++source;

 
 

-        delete data;
-        m_itemData.removeAt(indexToRemove);
+        if (nextRange < itemRanges.count() && source == itemRanges.at(nextRange).index) {
+            // Skip the items in the next removed range.
+            source += itemRanges.at(nextRange).count;
+            ++nextRange;
+        }

     }
 
     }
 

-    // The indexes of all m_items must be adjusted, not only the index
-    // of the removed items
-    const int itemDataCount = m_itemData.count();
-    for (int i = 0; i < itemDataCount; ++i) {
-        m_items.insert(m_itemData.at(i)->item.url(), i);
-    }
+    m_itemData.erase(m_itemData.end() - removedItemsCount, m_itemData.end());

 
 

-    if (count() <= 0) {
-        m_expandedParentsCountRoot = UninitializedExpandedParentsCountRoot;
-    }
+    // The indexes in m_items are not correct anymore. Therefore, we clear m_items.
+    // It will be re-populated with the updated indices if index(const QUrl&) is called.
+    m_items.clear();

 
 

-    itemRanges << KItemRange(removedAtIndex, removedCount);

     emit itemsRemoved(itemRanges);
 }
 
     emit itemsRemoved(itemRanges);
 }
 

-QList<KFileItemModel::ItemData*> KFileItemModel::createItemDataList(const KFileItemList& items) const
+QList<KFileItemModel::ItemData*> KFileItemModel::createItemDataList(const QUrl& parentUrl, const KFileItemList& items) const

 {
 {

+    if (m_sortRole == TypeRole) {
+        // Try to resolve the MIME-types synchronously to prevent a reordering of
+        // the items when sorting by type (per default MIME-types are resolved
+        // asynchronously by KFileItemModelRolesUpdater).
+        determineMimeTypes(items, 200);
+    }
+
+    const int parentIndex = index(parentUrl);
+    ItemData* parentItem = parentIndex < 0 ? 0 : m_itemData.at(parentIndex);
+

     QList<ItemData*> itemDataList;
     itemDataList.reserve(items.count());
 
     foreach (const KFileItem& item, items) {
         ItemData* itemData = new ItemData();
         itemData->item = item;
     QList<ItemData*> itemDataList;
     itemDataList.reserve(items.count());
 
     foreach (const KFileItem& item, items) {
         ItemData* itemData = new ItemData();
         itemData->item = item;

-        itemData->values = retrieveData(item);
-        itemData->parent = 0;
-
-        const bool determineParent = m_requestRole[ExpandedParentsCountRole]
-                                     && itemData->values["expandedParentsCount"].toInt() > 0;
-        if (determineParent) {
-            KUrl parentUrl = item.url().upUrl();
-            parentUrl.adjustPath(KUrl::RemoveTrailingSlash);
-            const int parentIndex = m_items.value(parentUrl, -1);
-            if (parentIndex >= 0) {
-                itemData->parent = m_itemData.at(parentIndex);
-            } else {
-                kWarning() << "Parent item not found for" << item.url();
+        itemData->parent = parentItem;
+        itemDataList.append(itemData);
+    }
+
+    return itemDataList;
+}
+
+void KFileItemModel::prepareItemsForSorting(QList<ItemData*>& itemDataList)
+{
+    switch (m_sortRole) {
+    case PermissionsRole:
+    case OwnerRole:
+    case GroupRole:
+    case DestinationRole:
+    case PathRole:
+    case DeletionTimeRole:
+        // These roles can be determined with retrieveData, and they have to be stored
+        // in the QHash "values" for the sorting.
+        foreach (ItemData* itemData, itemDataList) {
+            if (itemData->values.isEmpty()) {
+                itemData->values = retrieveData(itemData->item, itemData->parent);

             }
         }
             }
         }

+        break;

 
 

-        itemDataList.append(itemData);
+    case TypeRole:
+        // At least store the data including the file type for items with known MIME type.
+        foreach (ItemData* itemData, itemDataList) {
+            if (itemData->values.isEmpty()) {
+                const KFileItem item = itemData->item;
+                if (item.isDir() || item.isMimeTypeKnown()) {
+                    itemData->values = retrieveData(itemData->item, itemData->parent);
+                }
+            }
+        }
+        break;
+
+    default:
+        // The other roles are either resolved by KFileItemModelRolesUpdater
+        // (this includes the SizeRole for directories), or they do not need
+        // to be stored in the QHash "values" for sorting because the data can
+        // be retrieved directly from the KFileItem (NameRole, SizeRole for files,
+        // DateRole).
+        break;

     }
     }

+}

 
 

-    return itemDataList;
+int KFileItemModel::expandedParentsCount(const ItemData* data)
+{
+    // The hash 'values' is only guaranteed to contain the key "expandedParentsCount"
+    // if the corresponding item is expanded, and it is not a top-level item.
+    const ItemData* parent = data->parent;
+    if (parent) {
+        if (parent->parent) {
+            Q_ASSERT(parent->values.contains("expandedParentsCount"));
+            return parent->values.value("expandedParentsCount").toInt() + 1;
+        } else {
+            return 1;
+        }
+    } else {
+        return 0;
+    }

 }
 
 void KFileItemModel::removeExpandedItems()
 {
 }
 
 void KFileItemModel::removeExpandedItems()
 {

-    KFileItemList expandedItems;
+    QVector<int> indexesToRemove;

 
     const int maxIndex = m_itemData.count() - 1;
     for (int i = 0; i <= maxIndex; ++i) {
         const ItemData* itemData = m_itemData.at(i);
 
     const int maxIndex = m_itemData.count() - 1;
     for (int i = 0; i <= maxIndex; ++i) {
         const ItemData* itemData = m_itemData.at(i);

-        if (itemData->values.value("expandedParentsCount").toInt() > 0) {
-            expandedItems.append(itemData->item);
+        if (itemData->parent) {
+            indexesToRemove.append(i);

         }
     }
 
         }
     }
 

-    // The m_expandedParentsCountRoot may not get reset before all items with
-    // a bigger count have been removed.
-    removeItems(expandedItems);
-
-    m_expandedParentsCountRoot = UninitializedExpandedParentsCountRoot;
+    removeItems(KItemRangeList::fromSortedContainer(indexesToRemove), DeleteItemData);

     m_expandedDirs.clear();
     m_expandedDirs.clear();

+
+    // Also remove all filtered items which have a parent.
+    QHash<KFileItem, ItemData*>::iterator it = m_filteredItems.begin();
+    const QHash<KFileItem, ItemData*>::iterator end = m_filteredItems.end();
+
+    while (it != end) {
+        if (it.value()->parent) {
+            delete it.value();
+            it = m_filteredItems.erase(it);
+        } else {
+            ++it;
+        }
+    }
+}
+
+void KFileItemModel::emitItemsChangedAndTriggerResorting(const KItemRangeList& itemRanges, const QSet<QByteArray>& changedRoles)
+{
+    emit itemsChanged(itemRanges, changedRoles);
+
+    // Trigger a resorting if necessary. Note that this can happen even if the sort
+    // role has not changed at all because the file name can be used as a fallback.
+    if (changedRoles.contains(sortRole()) || changedRoles.contains(roleForType(NameRole))) {
+        foreach (const KItemRange& range, itemRanges) {
+            bool needsResorting = false;
+
+            const int first = range.index;
+            const int last = range.index + range.count - 1;
+
+            // Resorting the model is necessary if
+            // (a)  The first item in the range is "lessThan" its predecessor,
+            // (b)  the successor of the last item is "lessThan" the last item, or
+            // (c)  the internal order of the items in the range is incorrect.
+            if (first > 0
+                && lessThan(m_itemData.at(first), m_itemData.at(first - 1), m_collator)) {
+                needsResorting = true;
+            } else if (last < count() - 1
+                && lessThan(m_itemData.at(last + 1), m_itemData.at(last), m_collator)) {
+                needsResorting = true;
+            } else {
+                for (int index = first; index < last; ++index) {
+                    if (lessThan(m_itemData.at(index + 1), m_itemData.at(index), m_collator)) {
+                        needsResorting = true;
+                        break;
+                    }
+                }
+            }
+
+            if (needsResorting) {
+                m_resortAllItemsTimer->start();
+                return;
+            }
+        }
+    }
+
+    if (groupedSorting() && changedRoles.contains(sortRole())) {
+        // The position is still correct, but the groups might have changed
+        // if the changed item is either the first or the last item in a
+        // group.
+        // In principle, we could try to find out if the item really is the
+        // first or last one in its group and then update the groups
+        // (possibly with a delayed timer to make sure that we don't
+        // re-calculate the groups very often if items are updated one by
+        // one), but starting m_resortAllItemsTimer is easier.
+        m_resortAllItemsTimer->start();
+    }

 }
 
 void KFileItemModel::resetRoles()
 }
 
 void KFileItemModel::resetRoles()


@@ -1185,6 +1498,7 @@ KFileItemModel::RoleType KFileItemModel::typeForRole(const QByteArray& role) con
         // with KFileItemModel::roleForType() in case if a change is done).
         roles.insert("isDir", IsDirRole);
         roles.insert("isLink", IsLinkRole);
         // with KFileItemModel::roleForType() in case if a change is done).
         roles.insert("isDir", IsDirRole);
         roles.insert("isLink", IsLinkRole);

+        roles.insert("isHidden", IsHiddenRole);

         roles.insert("isExpanded", IsExpandedRole);
         roles.insert("isExpandable", IsExpandableRole);
         roles.insert("expandedParentsCount", ExpandedParentsCountRole);
         roles.insert("isExpanded", IsExpandedRole);
         roles.insert("isExpandable", IsExpandableRole);
         roles.insert("expandedParentsCount", ExpandedParentsCountRole);


@@ -1211,6 +1525,7 @@ QByteArray KFileItemModel::roleForType(RoleType roleType) const
         // with KFileItemModel::typeForRole() in case if a change is done).
         roles.insert(IsDirRole, "isDir");
         roles.insert(IsLinkRole, "isLink");
         // with KFileItemModel::typeForRole() in case if a change is done).
         roles.insert(IsDirRole, "isDir");
         roles.insert(IsLinkRole, "isLink");

+        roles.insert(IsHiddenRole, "isHidden");

         roles.insert(IsExpandedRole, "isExpanded");
         roles.insert(IsExpandableRole, "isExpandable");
         roles.insert(ExpandedParentsCountRole, "expandedParentsCount");
         roles.insert(IsExpandedRole, "isExpanded");
         roles.insert(IsExpandableRole, "isExpandable");
         roles.insert(ExpandedParentsCountRole, "expandedParentsCount");


@@ -1221,67 +1536,82 @@ QByteArray KFileItemModel::roleForType(RoleType roleType) const
     return roles.value(roleType);
 }
 
     return roles.value(roleType);
 }
 

-QHash<QByteArray, QVariant> KFileItemModel::retrieveData(const KFileItem& item) const
+QHash<QByteArray, QVariant> KFileItemModel::retrieveData(const KFileItem& item, const ItemData* parent) const

 {
     // It is important to insert only roles that are fast to retrieve. E.g.
     // KFileItem::iconName() can be very expensive if the MIME-type is unknown
     // and hence will be retrieved asynchronously by KFileItemModelRolesUpdater.
     QHash<QByteArray, QVariant> data;
 {
     // It is important to insert only roles that are fast to retrieve. E.g.
     // KFileItem::iconName() can be very expensive if the MIME-type is unknown
     // and hence will be retrieved asynchronously by KFileItemModelRolesUpdater.
     QHash<QByteArray, QVariant> data;

-    data.insert("url", item.url());
+    data.insert(sharedValue("url"), item.url());

 
     const bool isDir = item.isDir();
 
     const bool isDir = item.isDir();

-    if (m_requestRole[IsDirRole]) {
-        data.insert("isDir", isDir);
+    if (m_requestRole[IsDirRole] && isDir) {
+        data.insert(sharedValue("isDir"), true);
+    }
+
+    if (m_requestRole[IsLinkRole] && item.isLink()) {
+        data.insert(sharedValue("isLink"), true);

     }
 
     }
 

-    if (m_requestRole[IsLinkRole]) {
-        const bool isLink = item.isLink();
-        data.insert("isLink", isLink);
+    if (m_requestRole[IsHiddenRole] && item.isHidden()) {
+        data.insert(sharedValue("isHidden"), true);

     }
 
     if (m_requestRole[NameRole]) {
     }
 
     if (m_requestRole[NameRole]) {

-        data.insert("text", item.text());
+        data.insert(sharedValue("text"), item.text());

     }
 
     }
 

-    if (m_requestRole[SizeRole]) {
-        if (isDir) {
-            data.insert("size", QVariant());
-        } else {
-            data.insert("size", item.size());
-        }
+    if (m_requestRole[SizeRole] && !isDir) {
+        data.insert(sharedValue("size"), item.size());
+    }
+
+    if (m_requestRole[ModificationTimeRole]) {
+        // Don't use KFileItem::timeString() as this is too expensive when
+        // having several thousands of items. Instead the formatting of the
+        // date-time will be done on-demand by the view when the date will be shown.
+        const QDateTime dateTime = item.time(KFileItem::ModificationTime);
+        data.insert(sharedValue("modificationtime"), dateTime);
+    }
+
+    if (m_requestRole[CreationTimeRole]) {
+        // Don't use KFileItem::timeString() as this is too expensive when
+        // having several thousands of items. Instead the formatting of the
+        // date-time will be done on-demand by the view when the date will be shown.
+        const QDateTime dateTime = item.time(KFileItem::CreationTime);
+        data.insert(sharedValue("creationtime"), dateTime);

     }
 
     }
 

-    if (m_requestRole[DateRole]) {
+    if (m_requestRole[AccessTimeRole]) {

         // Don't use KFileItem::timeString() as this is too expensive when
         // having several thousands of items. Instead the formatting of the
         // date-time will be done on-demand by the view when the date will be shown.
         // Don't use KFileItem::timeString() as this is too expensive when
         // having several thousands of items. Instead the formatting of the
         // date-time will be done on-demand by the view when the date will be shown.

-        const KDateTime dateTime = item.time(KFileItem::ModificationTime);
-        data.insert("date", dateTime.dateTime());
+        const QDateTime dateTime = item.time(KFileItem::AccessTime);
+        data.insert(sharedValue("accesstime"), dateTime);

     }
 
     if (m_requestRole[PermissionsRole]) {
     }
 
     if (m_requestRole[PermissionsRole]) {

-        data.insert("permissions", item.permissionsString());
+        data.insert(sharedValue("permissions"), item.permissionsString());

     }
 
     if (m_requestRole[OwnerRole]) {
     }
 
     if (m_requestRole[OwnerRole]) {

-        data.insert("owner", item.user());
+        data.insert(sharedValue("owner"), item.user());

     }
 
     if (m_requestRole[GroupRole]) {
     }
 
     if (m_requestRole[GroupRole]) {

-        data.insert("group", item.group());
+        data.insert(sharedValue("group"), item.group());

     }
 
     if (m_requestRole[DestinationRole]) {
         QString destination = item.linkDest();
         if (destination.isEmpty()) {
     }
 
     if (m_requestRole[DestinationRole]) {
         QString destination = item.linkDest();
         if (destination.isEmpty()) {

-            destination = QLatin1String("-");
+            destination = QStringLiteral("-");

         }
         }

-        data.insert("destination", destination);
+        data.insert(sharedValue("destination"), destination);

     }
 
     if (m_requestRole[PathRole]) {
         QString path;
     }
 
     if (m_requestRole[PathRole]) {
         QString path;

-        if (item.url().protocol() == QLatin1String("trash")) {
+        if (item.url().scheme() == QLatin1String("trash")) {

             path = item.entry().stringValue(KIO::UDSEntry::UDS_EXTRA);
         } else {
             // For performance reasons cache the home-path in a static QString
             path = item.entry().stringValue(KIO::UDSEntry::UDS_EXTRA);
         } else {
             // For performance reasons cache the home-path in a static QString


@@ -1299,62 +1629,74 @@ QHash<QByteArray, QVariant> KFileItemModel::retrieveData(const KFileItem& item)
 
         const int index = path.lastIndexOf(item.text());
         path = path.mid(0, index - 1);
 
         const int index = path.lastIndexOf(item.text());
         path = path.mid(0, index - 1);

-        data.insert("path", path);
+        data.insert(sharedValue("path"), path);

     }
 
     }
 

-    if (m_requestRole[IsExpandedRole]) {
-        data.insert("isExpanded", false);
+    if (m_requestRole[DeletionTimeRole]) {
+        QDateTime deletionTime;
+        if (item.url().scheme() == QLatin1String("trash")) {
+            deletionTime = QDateTime::fromString(item.entry().stringValue(KIO::UDSEntry::UDS_EXTRA + 1), Qt::ISODate);
+        }
+        data.insert(sharedValue("deletiontime"), deletionTime);

     }
 
     }
 

-    if (m_requestRole[IsExpandableRole]) {
-        data.insert("isExpandable", item.isDir() && item.url() == item.targetUrl());
+    if (m_requestRole[IsExpandableRole] && isDir) {
+        data.insert(sharedValue("isExpandable"), true);

     }
 
     if (m_requestRole[ExpandedParentsCountRole]) {
     }
 
     if (m_requestRole[ExpandedParentsCountRole]) {

-        if (m_expandedParentsCountRoot == UninitializedExpandedParentsCountRoot) {
-            const KUrl rootUrl = m_dirLister->url();
-            const QString protocol = rootUrl.protocol();
-            const bool forceExpandedParentsCountRoot = (protocol == QLatin1String("trash") ||
-                                                        protocol == QLatin1String("nepomuk") ||
-                                                        protocol == QLatin1String("remote") ||
-                                                        protocol.contains(QLatin1String("search")));
-            if (forceExpandedParentsCountRoot) {
-                m_expandedParentsCountRoot = ForceExpandedParentsCountRoot;
-            } else {
-                const QString rootDir = rootUrl.path(KUrl::AddTrailingSlash);
-                m_expandedParentsCountRoot = rootDir.count('/');
-            }
-        }
-
-        if (m_expandedParentsCountRoot == ForceExpandedParentsCountRoot) {
-            data.insert("expandedParentsCount", -1);
-        } else {
-            const QString dir = item.url().directory(KUrl::AppendTrailingSlash);
-            const int level = dir.count('/') - m_expandedParentsCountRoot;
-            data.insert("expandedParentsCount", level);
+        if (parent) {
+            const int level = expandedParentsCount(parent) + 1;
+            data.insert(sharedValue("expandedParentsCount"), level);

         }
     }
 
     if (item.isMimeTypeKnown()) {
         }
     }
 
     if (item.isMimeTypeKnown()) {

-        data.insert("iconName", item.iconName());
+        data.insert(sharedValue("iconName"), item.iconName());

 
         if (m_requestRole[TypeRole]) {
 
         if (m_requestRole[TypeRole]) {

-            data.insert("type", item.mimeComment());
+            data.insert(sharedValue("type"), item.mimeComment());

         }
         }

+    } else if (m_requestRole[TypeRole] && isDir) {
+        static const QString folderMimeType = item.mimeComment();
+        data.insert(sharedValue("type"), folderMimeType);

     }
 
     return data;
 }
 
     }
 
     return data;
 }
 

-bool KFileItemModel::lessThan(const ItemData* a, const ItemData* b) const
+bool KFileItemModel::lessThan(const ItemData* a, const ItemData* b, const QCollator& collator) const

 {
     int result = 0;
 
 {
     int result = 0;
 

-    if (m_expandedParentsCountRoot >= 0) {
-        result = expandedParentsCountCompare(a, b);
-        if (result != 0) {
-            // The items have parents with different expansion levels
-            return (sortOrder() == Qt::AscendingOrder) ? result < 0 : result > 0;
+    if (a->parent != b->parent) {
+        const int expansionLevelA = expandedParentsCount(a);
+        const int expansionLevelB = expandedParentsCount(b);
+
+        // If b has a higher expansion level than a, check if a is a parent
+        // of b, and make sure that both expansion levels are equal otherwise.
+        for (int i = expansionLevelB; i > expansionLevelA; --i) {
+            if (b->parent == a) {
+                return true;
+            }
+            b = b->parent;
+        }
+
+        // If a has a higher expansion level than a, check if b is a parent
+        // of a, and make sure that both expansion levels are equal otherwise.
+        for (int i = expansionLevelA; i > expansionLevelB; --i) {
+            if (a->parent == b) {
+                return false;
+            }
+            a = a->parent;
+        }
+
+        Q_ASSERT(expandedParentsCount(a) == expandedParentsCount(b));
+
+        // Compare the last parents of a and b which are different.
+        while (a->parent != b->parent) {
+            a = a->parent;
+            b = b->parent;

         }
     }
 
         }
     }
 


@@ -1368,12 +1710,72 @@ bool KFileItemModel::lessThan(const ItemData* a, const ItemData* b) const
         }
     }
 
         }
     }
 

-    result = sortRoleCompare(a, b);
+    result = sortRoleCompare(a, b, collator);

 
     return (sortOrder() == Qt::AscendingOrder) ? result < 0 : result > 0;
 }
 
 
     return (sortOrder() == Qt::AscendingOrder) ? result < 0 : result > 0;
 }
 

-int KFileItemModel::sortRoleCompare(const ItemData* a, const ItemData* b) const
+/**
+ * Helper class for KFileItemModel::sort().
+ */
+class KFileItemModelLessThan
+{
+public:
+    KFileItemModelLessThan(const KFileItemModel* model, const QCollator& collator) :
+        m_model(model),
+        m_collator(collator)
+    {
+    }
+
+    KFileItemModelLessThan(const KFileItemModelLessThan& other) :
+        m_model(other.m_model),
+        m_collator()
+    {
+        m_collator.setCaseSensitivity(other.m_collator.caseSensitivity());
+        m_collator.setIgnorePunctuation(other.m_collator.ignorePunctuation());
+        m_collator.setLocale(other.m_collator.locale());
+        m_collator.setNumericMode(other.m_collator.numericMode());
+    }
+
+    ~KFileItemModelLessThan() = default;
+    //We do not delete m_model as the pointer was passed from outside ant it will be deleted elsewhere.
+
+    KFileItemModelLessThan& operator=(const KFileItemModelLessThan& other)
+    {
+        m_model = other.m_model;
+        m_collator = other.m_collator;
+        return *this;
+    }
+
+    bool operator()(const KFileItemModel::ItemData* a, const KFileItemModel::ItemData* b) const
+    {
+        return m_model->lessThan(a, b, m_collator);
+    }
+
+private:
+    const KFileItemModel* m_model;
+    QCollator m_collator;
+};
+
+void KFileItemModel::sort(QList<KFileItemModel::ItemData*>::iterator begin,
+                          QList<KFileItemModel::ItemData*>::iterator end) const
+{
+    KFileItemModelLessThan lessThan(this, m_collator);
+
+    if (m_sortRole == NameRole) {
+        // Sorting by name can be expensive, in particular if natural sorting is
+        // enabled. Use all CPU cores to speed up the sorting process.
+        static const int numberOfThreads = QThread::idealThreadCount();
+        parallelMergeSort(begin, end, lessThan, numberOfThreads);
+    } else {
+        // Sorting by other roles is quite fast. Use only one thread to prevent
+        // problems caused by non-reentrant comparison functions, see
+        // https://bugs.kde.org/show_bug.cgi?id=312679
+        mergeSort(begin, end, lessThan);
+    }
+}
+
+int KFileItemModel::sortRoleCompare(const ItemData* a, const ItemData* b, const QCollator& collator) const

 {
     const KFileItem& itemA = a->item;
     const KFileItem& itemB = b->item;
 {
     const KFileItem& itemA = a->item;
     const KFileItem& itemB = b->item;


@@ -1417,9 +1819,31 @@ int KFileItemModel::sortRoleCompare(const ItemData* a, const ItemData* b) const
         break;
     }
 
         break;
     }
 

-    case DateRole: {
-        const KDateTime dateTimeA = itemA.time(KFileItem::ModificationTime);
-        const KDateTime dateTimeB = itemB.time(KFileItem::ModificationTime);
+    case ModificationTimeRole: {
+        const QDateTime dateTimeA = itemA.time(KFileItem::ModificationTime);
+        const QDateTime dateTimeB = itemB.time(KFileItem::ModificationTime);
+        if (dateTimeA < dateTimeB) {
+            result = -1;
+        } else if (dateTimeA > dateTimeB) {
+            result = +1;
+        }
+        break;
+    }
+
+    case CreationTimeRole: {
+        const QDateTime dateTimeA = itemA.time(KFileItem::CreationTime);
+        const QDateTime dateTimeB = itemB.time(KFileItem::CreationTime);
+        if (dateTimeA < dateTimeB) {
+            result = -1;
+        } else if (dateTimeA > dateTimeB) {
+            result = +1;
+        }
+        break;
+    }
+
+    case DeletionTimeRole: {
+        const QDateTime dateTimeA = a->values.value("deletiontime").toDateTime();
+        const QDateTime dateTimeB = b->values.value("deletiontime").toDateTime();

         if (dateTimeA < dateTimeB) {
             result = -1;
         } else if (dateTimeA > dateTimeB) {
         if (dateTimeA < dateTimeB) {
             result = -1;
         } else if (dateTimeA > dateTimeB) {


@@ -1436,9 +1860,8 @@ int KFileItemModel::sortRoleCompare(const ItemData* a, const ItemData* b) const
     case ImageSizeRole: {
         // Alway use a natural comparing to interpret the numbers of a string like
         // "1600 x 1200" for having a correct sorting.
     case ImageSizeRole: {
         // Alway use a natural comparing to interpret the numbers of a string like
         // "1600 x 1200" for having a correct sorting.

-        result = KStringHandler::naturalCompare(a->values.value("imageSize").toString(),
-                                                b->values.value("imageSize").toString(),
-                                                Qt::CaseSensitive);
+        result = collator.compare(a->values.value("imageSize").toString(),
+                                  b->values.value("imageSize").toString());

         break;
     }
 
         break;
     }
 


@@ -1457,14 +1880,13 @@ int KFileItemModel::sortRoleCompare(const ItemData* a, const ItemData* b) const
     }
 
     // Fallback #1: Compare the text of the items
     }
 
     // Fallback #1: Compare the text of the items

-    result = stringCompare(itemA.text(), itemB.text());
+    result = stringCompare(itemA.text(), itemB.text(), collator);

     if (result != 0) {
         return result;
     }
 
     // Fallback #2: KFileItem::text() may not be unique in case UDS_DISPLAY_NAME is used
     if (result != 0) {
         return result;
     }
 
     // Fallback #2: KFileItem::text() may not be unique in case UDS_DISPLAY_NAME is used

-    result = stringCompare(itemA.name(m_caseSensitivity == Qt::CaseInsensitive),
-                           itemB.name(m_caseSensitivity == Qt::CaseInsensitive));
+    result = stringCompare(itemA.name(), itemB.name(), collator);

     if (result != 0) {
         return result;
     }
     if (result != 0) {
         return result;
     }


@@ -1475,108 +1897,21 @@ int KFileItemModel::sortRoleCompare(const ItemData* a, const ItemData* b) const
     return QString::compare(itemA.url().url(), itemB.url().url(), Qt::CaseSensitive);
 }
 
     return QString::compare(itemA.url().url(), itemB.url().url(), Qt::CaseSensitive);
 }
 

-int KFileItemModel::stringCompare(const QString& a, const QString& b) const
+int KFileItemModel::stringCompare(const QString& a, const QString& b, const QCollator& collator) const

 {
 {

-    // Taken from KDirSortFilterProxyModel (kdelibs/kfile/kdirsortfilterproxymodel.*)
-    // Copyright (C) 2006 by Peter Penz <peter.penz@gmx.at>
-    // Copyright (C) 2006 by Dominic Battre <dominic@battre.de>
-    // Copyright (C) 2006 by Martin Pool <mbp@canonical.com>
-
-    if (m_caseSensitivity == Qt::CaseInsensitive) {
-        const int result = m_naturalSorting ? KStringHandler::naturalCompare(a, b, Qt::CaseInsensitive)
-                                            : QString::compare(a, b, Qt::CaseInsensitive);
-        if (result != 0) {
-            // Only return the result, if the strings are not equal. If they are equal by a case insensitive
-            // comparison, still a deterministic sort order is required. A case sensitive
-            // comparison is done as fallback.
-            return result;
-        }
-    }
-
-    return m_naturalSorting ? KStringHandler::naturalCompare(a, b, Qt::CaseSensitive)
-                            : QString::compare(a, b, Qt::CaseSensitive);
-}
-
-int KFileItemModel::expandedParentsCountCompare(const ItemData* a, const ItemData* b) const
-{
-    const KUrl urlA = a->item.url();
-    const KUrl urlB = b->item.url();
-    if (urlA.directory() == urlB.directory()) {
-        // Both items have the same directory as parent
-        return 0;
-    }
-
-    // Check whether one item is the parent of the other item
-    if (urlA.isParentOf(urlB)) {
-        return (sortOrder() == Qt::AscendingOrder) ? -1 : +1;
-    } else if (urlB.isParentOf(urlA)) {
-        return (sortOrder() == Qt::AscendingOrder) ? +1 : -1;
-    }
-
-    // Determine the maximum common path of both items and
-    // remember the index in 'index'
-    const QString pathA = urlA.path();
-    const QString pathB = urlB.path();
-
-    const int maxIndex = qMin(pathA.length(), pathB.length()) - 1;
-    int index = 0;
-    while (index <= maxIndex && pathA.at(index) == pathB.at(index)) {
-        ++index;
-    }
-    if (index > maxIndex) {
-        index = maxIndex;
-    }
-    while (index > 0 && (pathA.at(index) != QLatin1Char('/') || pathB.at(index) != QLatin1Char('/'))) {
-        --index;
-    }
-
-    // Determine the first sub-path after the common path and
-    // check whether it represents a directory or already a file
-    bool isDirA = true;
-    const QString subPathA = subPath(a->item, pathA, index, &isDirA);
-    bool isDirB = true;
-    const QString subPathB = subPath(b->item, pathB, index, &isDirB);
-
-    if (m_sortDirsFirst || m_sortRole == SizeRole) {
-        if (isDirA && !isDirB) {
-            return (sortOrder() == Qt::AscendingOrder) ? -1 : +1;
-        } else if (!isDirA && isDirB) {
-            return (sortOrder() == Qt::AscendingOrder) ? +1 : -1;
-        }
-    }
-
-    // Compare the items of the parents that represent the first
-    // different path after the common path.
-    const QString parentPathA = pathA.left(index) + subPathA;
-    const QString parentPathB = pathB.left(index) + subPathB;
-
-    const ItemData* parentA = a;
-    while (parentA && parentA->item.url().path() != parentPathA) {
-        parentA = parentA->parent;
-    }
-
-    const ItemData* parentB = b;
-    while (parentB && parentB->item.url().path() != parentPathB) {
-        parentB = parentB->parent;
+    if (m_naturalSorting) {
+        return collator.compare(a, b);

     }
 
     }
 

-    if (parentA && parentB) {
-        return sortRoleCompare(parentA, parentB);
+    const int result = QString::compare(a, b, collator.caseSensitivity());
+    if (result != 0 || collator.caseSensitivity() == Qt::CaseSensitive) {
+        // Only return the result, if the strings are not equal. If they are equal by a case insensitive
+        // comparison, still a deterministic sort order is required. A case sensitive
+        // comparison is done as fallback.
+        return result;

     }
 
     }
 

-    kWarning() << "Child items without parent detected:" << a->item.url() << b->item.url();
-    return QString::compare(urlA.url(), urlB.url(), Qt::CaseSensitive);
-}
-
-QString KFileItemModel::subPath(const KFileItem& item,
-                                const QString& itemPath,
-                                int start,
-                                bool* isDir) const
-{
-    Q_ASSERT(isDir);
-    const int pathIndex = itemPath.indexOf('/', start + 1);
-    *isDir = (pathIndex > 0) || item.isDir();
-    return itemPath.mid(start, pathIndex - start);
+    return QString::compare(a, b, Qt::CaseSensitive);

 }
 
 bool KFileItemModel::useMaximumUpdateInterval() const
 }
 
 bool KFileItemModel::useMaximumUpdateInterval() const


@@ -1593,13 +1928,12 @@ QList<QPair<int, QVariant> > KFileItemModel::nameRoleGroups() const
 
     QString groupValue;
     QChar firstChar;
 
     QString groupValue;
     QChar firstChar;

-    bool isLetter = false;

     for (int i = 0; i <= maxIndex; ++i) {
         if (isChildItem(i)) {
             continue;
         }
 
     for (int i = 0; i <= maxIndex; ++i) {
         if (isChildItem(i)) {
             continue;
         }
 

-        const QString name = m_itemData.at(i)->values.value("text").toString();
+        const QString name = m_itemData.at(i)->item.text();

 
         // Use the first character of the name as group indication
         QChar newFirstChar = name.at(0).toUpper();
 
         // Use the first character of the name as group indication
         QChar newFirstChar = name.at(0).toUpper();


@@ -1609,31 +1943,36 @@ QList<QPair<int, QVariant> > KFileItemModel::nameRoleGroups() const
 
         if (firstChar != newFirstChar) {
             QString newGroupValue;
 
         if (firstChar != newFirstChar) {
             QString newGroupValue;

-            if (newFirstChar >= QLatin1Char('A') && newFirstChar <= QLatin1Char('Z')) {
-                // Apply group 'A' - 'Z'
-                newGroupValue = newFirstChar;
-                isLetter = true;
+            if (newFirstChar.isLetter()) {
+                // Try to find a matching group in the range 'A' to 'Z'.
+                static std::vector<QChar> lettersAtoZ;
+                lettersAtoZ.reserve('Z' - 'A' + 1);
+                if (lettersAtoZ.empty()) {
+                    for (char c = 'A'; c <= 'Z'; ++c) {
+                        lettersAtoZ.push_back(QLatin1Char(c));
+                    }
+                }
+
+                auto localeAwareLessThan = [this](QChar c1, QChar c2) -> bool {
+                    return m_collator.compare(c1, c2) < 0;
+                };
+
+                std::vector<QChar>::iterator it = std::lower_bound(lettersAtoZ.begin(), lettersAtoZ.end(), newFirstChar, localeAwareLessThan);
+                if (it != lettersAtoZ.end()) {
+                    if (localeAwareLessThan(newFirstChar, *it) && it != lettersAtoZ.begin()) {
+                        // newFirstChar belongs to the group preceding *it.
+                        // Example: for an umlaut 'A' in the German locale, *it would be 'B' now.
+                        --it;
+                    }
+                    newGroupValue = *it;
+                } else {
+                    newGroupValue = newFirstChar;
+                }

             } else if (newFirstChar >= QLatin1Char('0') && newFirstChar <= QLatin1Char('9')) {
                 // Apply group '0 - 9' for any name that starts with a digit
                 newGroupValue = i18nc("@title:group Groups that start with a digit", "0 - 9");
             } else if (newFirstChar >= QLatin1Char('0') && newFirstChar <= QLatin1Char('9')) {
                 // Apply group '0 - 9' for any name that starts with a digit
                 newGroupValue = i18nc("@title:group Groups that start with a digit", "0 - 9");

-                isLetter = false;

             } else {
             } else {

-                if (isLetter) {
-                    // If the current group is 'A' - 'Z' check whether a locale character
-                    // fits into the existing group.
-                    // TODO: This does not work in the case if e.g. the group 'O' starts with
-                    // an umlaut 'O' -> provide unit-test to document this known issue
-                    const QChar prevChar(firstChar.unicode() - ushort(1));
-                    const QChar nextChar(firstChar.unicode() + ushort(1));
-                    const QString currChar(newFirstChar);
-                    const bool partOfCurrentGroup = currChar.localeAwareCompare(prevChar) > 0 &&
-                                                    currChar.localeAwareCompare(nextChar) < 0;
-                    if (partOfCurrentGroup) {
-                        continue;
-                    }
-                }

                 newGroupValue = i18nc("@title:group", "Others");
                 newGroupValue = i18nc("@title:group", "Others");

-                isLetter = false;

             }
 
             if (newGroupValue != groupValue) {
             }
 
             if (newGroupValue != groupValue) {


@@ -1682,61 +2021,50 @@ QList<QPair<int, QVariant> > KFileItemModel::sizeRoleGroups() const
     return groups;
 }
 
     return groups;
 }
 

-QList<QPair<int, QVariant> > KFileItemModel::dateRoleGroups() const
+QList<QPair<int, QVariant> > KFileItemModel::timeRoleGroups(std::function<QDateTime(const ItemData *)> fileTimeCb) const

 {
     Q_ASSERT(!m_itemData.isEmpty());
 
     const int maxIndex = count() - 1;
     QList<QPair<int, QVariant> > groups;
 
 {
     Q_ASSERT(!m_itemData.isEmpty());
 
     const int maxIndex = count() - 1;
     QList<QPair<int, QVariant> > groups;
 

-    const QDate currentDate = KDateTime::currentLocalDateTime().date();
-
-    int yearForCurrentWeek = 0;
-    int currentWeek = currentDate.weekNumber(&yearForCurrentWeek);
-    if (yearForCurrentWeek == currentDate.year() + 1) {
-        currentWeek = 53;
-    }
+    const QDate currentDate = QDate::currentDate();

 
 

-    QDate previousModifiedDate;
+    QDate previousFileDate;

     QString groupValue;
     for (int i = 0; i <= maxIndex; ++i) {
         if (isChildItem(i)) {
             continue;
         }
 
     QString groupValue;
     for (int i = 0; i <= maxIndex; ++i) {
         if (isChildItem(i)) {
             continue;
         }
 

-        const KDateTime modifiedTime = m_itemData.at(i)->item.time(KFileItem::ModificationTime);
-        const QDate modifiedDate = modifiedTime.date();
-        if (modifiedDate == previousModifiedDate) {
+        const QDateTime fileTime = fileTimeCb(m_itemData.at(i));
+        const QDate fileDate = fileTime.date();
+        if (fileDate == previousFileDate) {

             // The current item is in the same group as the previous item
             continue;
         }
             // The current item is in the same group as the previous item
             continue;
         }

-        previousModifiedDate = modifiedDate;
+        previousFileDate = fileDate;

 
 

-        const int daysDistance = modifiedDate.daysTo(currentDate);
-
-        int yearForModifiedWeek = 0;
-        int modifiedWeek = modifiedDate.weekNumber(&yearForModifiedWeek);
-        if (yearForModifiedWeek == modifiedDate.year() + 1) {
-            modifiedWeek = 53;
-        }
+        const int daysDistance = fileDate.daysTo(currentDate);

 
         QString newGroupValue;
 
         QString newGroupValue;

-        if (currentDate.year() == modifiedDate.year() && currentDate.month() == modifiedDate.month()) {
-            if (modifiedWeek > currentWeek) {
-                // Usecase: modified date = 2010-01-01, current date = 2010-01-22
-                //          modified week = 53,         current week = 3
-                modifiedWeek = 0;
-            }
-            switch (currentWeek - modifiedWeek) {
+        if (currentDate.year() == fileDate.year() &&
+            currentDate.month() == fileDate.month()) {
+
+            switch (daysDistance / 7) {

             case 0:
                 switch (daysDistance) {
                 case 0:  newGroupValue = i18nc("@title:group Date", "Today"); break;
                 case 1:  newGroupValue = i18nc("@title:group Date", "Yesterday"); break;
             case 0:
                 switch (daysDistance) {
                 case 0:  newGroupValue = i18nc("@title:group Date", "Today"); break;
                 case 1:  newGroupValue = i18nc("@title:group Date", "Yesterday"); break;

-                default: newGroupValue = modifiedTime.toString(i18nc("@title:group The week day name: %A", "%A"));
+                default:
+                    newGroupValue = fileTime.toString(
+                        i18nc("@title:group Date: The week day name: dddd", "dddd"));
+                    newGroupValue = i18nc("Can be used to script translation of \"dddd\""
+                        "with context @title:group Date", "%1", newGroupValue);

                 }
                 break;
             case 1:
                 }
                 break;
             case 1:

-                newGroupValue = i18nc("@title:group Date", "Last Week");
+                newGroupValue = i18nc("@title:group Date", "One Week Ago");

                 break;
             case 2:
                 newGroupValue = i18nc("@title:group Date", "Two Weeks Ago");
                 break;
             case 2:
                 newGroupValue = i18nc("@title:group Date", "Two Weeks Ago");


@@ -1753,22 +2081,60 @@ QList<QPair<int, QVariant> > KFileItemModel::dateRoleGroups() const
             }
         } else {
             const QDate lastMonthDate = currentDate.addMonths(-1);
             }
         } else {
             const QDate lastMonthDate = currentDate.addMonths(-1);

-            if  (lastMonthDate.year() == modifiedDate.year() && lastMonthDate.month() == modifiedDate.month()) {
+            if  (lastMonthDate.year() == fileDate.year() &&
+                 lastMonthDate.month() == fileDate.month()) {
+

                 if (daysDistance == 1) {
                 if (daysDistance == 1) {

-                    newGroupValue = modifiedTime.toString(i18nc("@title:group Date: %B is full month name in current locale, and %Y is full year number", "Yesterday (%B, %Y)"));
+                    newGroupValue = fileTime.toString(i18nc("@title:group Date: "
+                        "MMMM is full month name in current locale, and yyyy is "
+                        "full year number", "'Yesterday' (MMMM, yyyy)"));
+                    newGroupValue = i18nc("Can be used to script translation of "
+                        "\"'Yesterday' (MMMM, yyyy)\" with context @title:group Date",
+                        "%1", newGroupValue);

                 } else if (daysDistance <= 7) {
                 } else if (daysDistance <= 7) {

-                    newGroupValue = modifiedTime.toString(i18nc("@title:group The week day name: %A, %B is full month name in current locale, and %Y is full year number", "%A (%B, %Y)"));
+                    newGroupValue = fileTime.toString(i18nc("@title:group Date: "
+                        "The week day name: dddd, MMMM is full month name "
+                        "in current locale, and yyyy is full year number",
+                        "dddd (MMMM, yyyy)"));
+                    newGroupValue = i18nc("Can be used to script translation of "
+                        "\"dddd (MMMM, yyyy)\" with context @title:group Date",
+                        "%1", newGroupValue);

                 } else if (daysDistance <= 7 * 2) {
                 } else if (daysDistance <= 7 * 2) {

-                    newGroupValue = modifiedTime.toString(i18nc("@title:group Date: %B is full month name in current locale, and %Y is full year number", "Last Week (%B, %Y)"));
+                    newGroupValue = fileTime.toString(i18nc("@title:group Date: "
+                        "MMMM is full month name in current locale, and yyyy is "
+                        "full year number", "'One Week Ago' (MMMM, yyyy)"));
+                    newGroupValue = i18nc("Can be used to script translation of "
+                        "\"'One Week Ago' (MMMM, yyyy)\" with context @title:group Date",
+                        "%1", newGroupValue);

                 } else if (daysDistance <= 7 * 3) {
                 } else if (daysDistance <= 7 * 3) {

-                    newGroupValue = modifiedTime.toString(i18nc("@title:group Date: %B is full month name in current locale, and %Y is full year number", "Two Weeks Ago (%B, %Y)"));
+                    newGroupValue = fileTime.toString(i18nc("@title:group Date: "
+                        "MMMM is full month name in current locale, and yyyy is "
+                        "full year number", "'Two Weeks Ago' (MMMM, yyyy)"));
+                    newGroupValue = i18nc("Can be used to script translation of "
+                        "\"'Two Weeks Ago' (MMMM, yyyy)\" with context @title:group Date",
+                        "%1", newGroupValue);

                 } else if (daysDistance <= 7 * 4) {
                 } else if (daysDistance <= 7 * 4) {

-                    newGroupValue = modifiedTime.toString(i18nc("@title:group Date: %B is full month name in current locale, and %Y is full year number", "Three Weeks Ago (%B, %Y)"));
+                    newGroupValue = fileTime.toString(i18nc("@title:group Date: "
+                        "MMMM is full month name in current locale, and yyyy is "
+                        "full year number", "'Three Weeks Ago' (MMMM, yyyy)"));
+                    newGroupValue = i18nc("Can be used to script translation of "
+                        "\"'Three Weeks Ago' (MMMM, yyyy)\" with context @title:group Date",
+                        "%1", newGroupValue);

                 } else {
                 } else {

-                    newGroupValue = modifiedTime.toString(i18nc("@title:group Date: %B is full month name in current locale, and %Y is full year number", "Earlier on %B, %Y"));
+                    newGroupValue = fileTime.toString(i18nc("@title:group Date: "
+                        "MMMM is full month name in current locale, and yyyy is "
+                        "full year number", "'Earlier on' MMMM, yyyy"));
+                    newGroupValue = i18nc("Can be used to script translation of "
+                        "\"'Earlier on' MMMM, yyyy\" with context @title:group Date",
+                        "%1", newGroupValue);

                 }
             } else {
                 }
             } else {

-                newGroupValue = modifiedTime.toString(i18nc("@title:group The month and year: %B is full month name in current locale, and %Y is full year number", "%B, %Y"));
+                newGroupValue = fileTime.toString(i18nc("@title:group "
+                    "The month and year: MMMM is full month name in current locale, "
+                    "and yyyy is full year number", "MMMM, yyyy"));
+                newGroupValue = i18nc("Can be used to script translation of "
+                    "\"MMMM, yyyy\" with context @title:group Date",
+                    "%1", newGroupValue);

             }
         }
 
             }
         }
 


@@ -1802,7 +2168,7 @@ QList<QPair<int, QVariant> > KFileItemModel::permissionRoleGroups() const
         }
         permissionsString = newPermissionsString;
 
         }
         permissionsString = newPermissionsString;
 

-        const QFileInfo info(itemData->item.url().pathOrUrl());
+        const QFileInfo info(itemData->item.url().toLocalFile());

 
         // Set user string
         QString user;
 
         // Set user string
         QString user;


@@ -1899,23 +2265,6 @@ QList<QPair<int, QVariant> > KFileItemModel::genericStringRoleGroups(const QByte
     return groups;
 }
 
     return groups;
 }
 

-KFileItemList KFileItemModel::childItems(const KFileItem& item) const
-{
-    KFileItemList items;
-
-    int index = m_items.value(item.url(), -1);
-    if (index >= 0) {
-        const int parentLevel = m_itemData.at(index)->values.value("expandedParentsCount").toInt();
-        ++index;
-        while (index < m_itemData.count() && m_itemData.at(index)->values.value("expandedParentsCount").toInt() > parentLevel) {
-            items.append(m_itemData.at(index)->item);
-            ++index;
-        }
-    }
-
-    return items;
-}
-

 void KFileItemModel::emitSortProgress(int resolvedCount)
 {
     // Be tolerant against a resolvedCount with a wrong range.
 void KFileItemModel::emitSortProgress(int resolvedCount)
 {
     // Be tolerant against a resolvedCount with a wrong range.


@@ -1947,26 +2296,34 @@ void KFileItemModel::emitSortProgress(int resolvedCount)
 const KFileItemModel::RoleInfoMap* KFileItemModel::rolesInfoMap(int& count)
 {
     static const RoleInfoMap rolesInfoMap[] = {
 const KFileItemModel::RoleInfoMap* KFileItemModel::rolesInfoMap(int& count)
 {
     static const RoleInfoMap rolesInfoMap[] = {

-    //  | role         | roleType       | role translation                                | group translation           | requires Nepomuk | requires indexer
-        { 0,             NoRole,          0, 0,                                             0, 0,                                     false, false },
-        { "text",        NameRole,        I18N_NOOP2_NOSTRIP("@label", "Name"),             0, 0,                                     false, false },
-        { "size",        SizeRole,        I18N_NOOP2_NOSTRIP("@label", "Size"),             0, 0,                                     false, false },
-        { "date",        DateRole,        I18N_NOOP2_NOSTRIP("@label", "Date"),             0, 0,                                     false, false },
-        { "type",        TypeRole,        I18N_NOOP2_NOSTRIP("@label", "Type"),             0, 0,                                     false, false },
-        { "rating",      RatingRole,      I18N_NOOP2_NOSTRIP("@label", "Rating"),           0, 0,                                     true,  false },
-        { "tags",        TagsRole,        I18N_NOOP2_NOSTRIP("@label", "Tags"),             0, 0,                                     true,  false },
-        { "comment",     CommentRole,     I18N_NOOP2_NOSTRIP("@label", "Comment"),          0, 0,                                     true,  false },
+    //  | role         | roleType       | role translation                                | group translation           | requires Baloo   | requires indexer
+        { nullptr,             NoRole,          nullptr, nullptr,                                             nullptr, nullptr,                                     false, false },
+        { "text",        NameRole,        I18N_NOOP2_NOSTRIP("@label", "Name"),             nullptr, nullptr,                                     false, false },
+        { "size",        SizeRole,        I18N_NOOP2_NOSTRIP("@label", "Size"),             nullptr, nullptr,                                     false, false },
+        { "modificationtime",        ModificationTimeRole,        I18N_NOOP2_NOSTRIP("@label", "Modified"),             nullptr, nullptr,                                     false, false },
+        { "creationtime",        CreationTimeRole,        I18N_NOOP2_NOSTRIP("@label", "Created"),             nullptr, nullptr,                                     false, false },
+        { "accesstime",        AccessTimeRole,        I18N_NOOP2_NOSTRIP("@label", "Accessed"),             nullptr, nullptr,                                     false, false },
+        { "type",        TypeRole,        I18N_NOOP2_NOSTRIP("@label", "Type"),             nullptr, nullptr,                                     false, false },
+        { "rating",      RatingRole,      I18N_NOOP2_NOSTRIP("@label", "Rating"),           nullptr, nullptr,                                     true,  false },
+        { "tags",        TagsRole,        I18N_NOOP2_NOSTRIP("@label", "Tags"),             nullptr, nullptr,                                     true,  false },
+        { "comment",     CommentRole,     I18N_NOOP2_NOSTRIP("@label", "Comment"),          nullptr, nullptr,                                     true,  false },
+        { "title",       TitleRole,       I18N_NOOP2_NOSTRIP("@label", "Title"),            I18N_NOOP2_NOSTRIP("@label", "Document"), true,  true  },

         { "wordCount",   WordCountRole,   I18N_NOOP2_NOSTRIP("@label", "Word Count"),       I18N_NOOP2_NOSTRIP("@label", "Document"), true,  true  },
         { "lineCount",   LineCountRole,   I18N_NOOP2_NOSTRIP("@label", "Line Count"),       I18N_NOOP2_NOSTRIP("@label", "Document"), true,  true  },
         { "wordCount",   WordCountRole,   I18N_NOOP2_NOSTRIP("@label", "Word Count"),       I18N_NOOP2_NOSTRIP("@label", "Document"), true,  true  },
         { "lineCount",   LineCountRole,   I18N_NOOP2_NOSTRIP("@label", "Line Count"),       I18N_NOOP2_NOSTRIP("@label", "Document"), true,  true  },

+        { "imageDateTime",   ImageDateTimeRole,   I18N_NOOP2_NOSTRIP("@label", "Date Photographed"),       I18N_NOOP2_NOSTRIP("@label", "Image"),    true,  true  },

         { "imageSize",   ImageSizeRole,   I18N_NOOP2_NOSTRIP("@label", "Image Size"),       I18N_NOOP2_NOSTRIP("@label", "Image"),    true,  true  },
         { "orientation", OrientationRole, I18N_NOOP2_NOSTRIP("@label", "Orientation"),      I18N_NOOP2_NOSTRIP("@label", "Image"),    true,  true  },
         { "artist",      ArtistRole,      I18N_NOOP2_NOSTRIP("@label", "Artist"),           I18N_NOOP2_NOSTRIP("@label", "Audio"),    true,  true  },
         { "imageSize",   ImageSizeRole,   I18N_NOOP2_NOSTRIP("@label", "Image Size"),       I18N_NOOP2_NOSTRIP("@label", "Image"),    true,  true  },
         { "orientation", OrientationRole, I18N_NOOP2_NOSTRIP("@label", "Orientation"),      I18N_NOOP2_NOSTRIP("@label", "Image"),    true,  true  },
         { "artist",      ArtistRole,      I18N_NOOP2_NOSTRIP("@label", "Artist"),           I18N_NOOP2_NOSTRIP("@label", "Audio"),    true,  true  },

+        { "genre",       GenreRole,       I18N_NOOP2_NOSTRIP("@label", "Genre"),            I18N_NOOP2_NOSTRIP("@label", "Audio"),    true,  true  },

         { "album",       AlbumRole,       I18N_NOOP2_NOSTRIP("@label", "Album"),            I18N_NOOP2_NOSTRIP("@label", "Audio"),    true,  true  },
         { "duration",    DurationRole,    I18N_NOOP2_NOSTRIP("@label", "Duration"),         I18N_NOOP2_NOSTRIP("@label", "Audio"),    true,  true  },
         { "album",       AlbumRole,       I18N_NOOP2_NOSTRIP("@label", "Album"),            I18N_NOOP2_NOSTRIP("@label", "Audio"),    true,  true  },
         { "duration",    DurationRole,    I18N_NOOP2_NOSTRIP("@label", "Duration"),         I18N_NOOP2_NOSTRIP("@label", "Audio"),    true,  true  },

+        { "bitrate",     BitrateRole,     I18N_NOOP2_NOSTRIP("@label", "Bitrate"),          I18N_NOOP2_NOSTRIP("@label", "Audio"),    true,  true  },

         { "track",       TrackRole,       I18N_NOOP2_NOSTRIP("@label", "Track"),            I18N_NOOP2_NOSTRIP("@label", "Audio"),    true,  true  },
         { "track",       TrackRole,       I18N_NOOP2_NOSTRIP("@label", "Track"),            I18N_NOOP2_NOSTRIP("@label", "Audio"),    true,  true  },

+        { "releaseYear", ReleaseYearRole, I18N_NOOP2_NOSTRIP("@label", "Release Year"),     I18N_NOOP2_NOSTRIP("@label", "Audio"),    true,  true  },

         { "path",        PathRole,        I18N_NOOP2_NOSTRIP("@label", "Path"),             I18N_NOOP2_NOSTRIP("@label", "Other"),    false, false },
         { "path",        PathRole,        I18N_NOOP2_NOSTRIP("@label", "Path"),             I18N_NOOP2_NOSTRIP("@label", "Other"),    false, false },

+        { "deletiontime",DeletionTimeRole,I18N_NOOP2_NOSTRIP("@label", "Deletion Time"),    I18N_NOOP2_NOSTRIP("@label", "Other"),    false, false },

         { "destination", DestinationRole, I18N_NOOP2_NOSTRIP("@label", "Link Destination"), I18N_NOOP2_NOSTRIP("@label", "Other"),    false, false },
         { "destination", DestinationRole, I18N_NOOP2_NOSTRIP("@label", "Link Destination"), I18N_NOOP2_NOSTRIP("@label", "Other"),    false, false },

-        { "copiedFrom",  CopiedFromRole,  I18N_NOOP2_NOSTRIP("@label", "Copied From"),      I18N_NOOP2_NOSTRIP("@label", "Other"),    true,  false },
+        { "originUrl",   OriginUrlRole,   I18N_NOOP2_NOSTRIP("@label", "Downloaded From"),  I18N_NOOP2_NOSTRIP("@label", "Other"),    true,  false },

         { "permissions", PermissionsRole, I18N_NOOP2_NOSTRIP("@label", "Permissions"),      I18N_NOOP2_NOSTRIP("@label", "Other"),    false, false },
         { "owner",       OwnerRole,       I18N_NOOP2_NOSTRIP("@label", "Owner"),            I18N_NOOP2_NOSTRIP("@label", "Other"),    false, false },
         { "group",       GroupRole,       I18N_NOOP2_NOSTRIP("@label", "User Group"),       I18N_NOOP2_NOSTRIP("@label", "Other"),    false, false },
         { "permissions", PermissionsRole, I18N_NOOP2_NOSTRIP("@label", "Permissions"),      I18N_NOOP2_NOSTRIP("@label", "Other"),    false, false },
         { "owner",       OwnerRole,       I18N_NOOP2_NOSTRIP("@label", "Owner"),            I18N_NOOP2_NOSTRIP("@label", "Other"),    false, false },
         { "group",       GroupRole,       I18N_NOOP2_NOSTRIP("@label", "User Group"),       I18N_NOOP2_NOSTRIP("@label", "Other"),    false, false },


@@ -1980,8 +2337,16 @@ void KFileItemModel::determineMimeTypes(const KFileItemList& items, int timeout)
 {
     QElapsedTimer timer;
     timer.start();
 {
     QElapsedTimer timer;
     timer.start();

-    foreach (KFileItem item, items) { // krazy:exclude=foreach
-        item.determineMimeType();
+    foreach (const KFileItem& item, items) { // krazy:exclude=foreach
+        // Only determine mime types for files here. For directories,
+        // KFileItem::determineMimeType() reads the .directory file inside to
+        // load the icon, but this is not necessary at all if we just need the
+        // type. Some special code for setting the correct mime type for
+        // directories is in retrieveData().
+        if (!item.isDir()) {
+            item.determineMimeType();
+        }
+

         if (timer.elapsed() > timeout) {
             // Don't block the user interface, let the remaining items
             // be resolved asynchronously.
         if (timer.elapsed() > timeout) {
             // Don't block the user interface, let the remaining items
             // be resolved asynchronously.


@@ -1990,4 +2355,64 @@ void KFileItemModel::determineMimeTypes(const KFileItemList& items, int timeout)
     }
 }
 
     }
 }
 

-#include "kfileitemmodel.moc"
+QByteArray KFileItemModel::sharedValue(const QByteArray& value)
+{
+    static QSet<QByteArray> pool;
+    const QSet<QByteArray>::const_iterator it = pool.constFind(value);
+
+    if (it != pool.constEnd()) {
+        return *it;
+    } else {
+        pool.insert(value);
+        return value;
+    }
+}
+
+bool KFileItemModel::isConsistent() const
+{
+    // m_items may contain less items than m_itemData because m_items
+    // is populated lazily, see KFileItemModel::index(const QUrl& url).
+    if (m_items.count() > m_itemData.count()) {
+        return false;
+    }
+
+    for (int i = 0, iMax = count(); i < iMax; ++i) {
+        // Check if m_items and m_itemData are consistent.
+        const KFileItem item = fileItem(i);
+        if (item.isNull()) {
+            qCWarning(DolphinDebug) << "Item" << i << "is null";
+            return false;
+        }
+
+        const int itemIndex = index(item);
+        if (itemIndex != i) {
+            qCWarning(DolphinDebug) << "Item" << i << "has a wrong index:" << itemIndex;
+            return false;
+        }
+
+        // Check if the items are sorted correctly.
+        if (i > 0 && !lessThan(m_itemData.at(i - 1), m_itemData.at(i), m_collator)) {
+            qCWarning(DolphinDebug) << "The order of items" << i - 1 << "and" << i << "is wrong:"
+                << fileItem(i - 1) << fileItem(i);
+            return false;
+        }
+
+        // Check if all parent-child relationships are consistent.
+        const ItemData* data = m_itemData.at(i);
+        const ItemData* parent = data->parent;
+        if (parent) {
+            if (expandedParentsCount(data) != expandedParentsCount(parent) + 1) {
+                qCWarning(DolphinDebug) << "expandedParentsCount is inconsistent for parent" << parent->item << "and child" << data->item;
+                return false;
+            }
+
+            const int parentIndex = index(parent->item);
+            if (parentIndex >= i) {
+                qCWarning(DolphinDebug) << "Index" << parentIndex << "of parent" << parent->item << "is not smaller than index" << i << "of child" << data->item;
+                return false;
+            }
+        }
+    }
+
+    return true;
+}