Merge remote-tracking branch 'origin/KDE/4.11'

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

diff --git a/src/kitemviews/kfileitemmodel.cpp b/src/kitemviews/kfileitemmodel.cpp
index 60fc27546bb435e5d73f7378be41334cd50eec49..37a30519af74277a985d977cd2acbc0eb8bb3618 100644 (file)
--- a/src/kitemviews/kfileitemmodel.cpp
+++ b/src/kitemviews/kfileitemmodel.cpp
@@ -1,22 +1,23 @@
-/***************************************************************************
- *   Copyright (C) 2011 by Peter Penz <peter.penz19@gmail.com>             *
- *   Copyright (C) 2013 by Frank Reininghaus <frank78ac@googlemail.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"
 


@@ -34,6 +35,9 @@
 #include <QTimer>
 #include <QWidget>
 
 #include <QTimer>
 #include <QWidget>
 

+#include <algorithm>
+#include <vector>
+

 // #define KFILEITEMMODEL_DEBUG
 
 KFileItemModel::KFileItemModel(QObject* parent) :
 // #define KFILEITEMMODEL_DEBUG
 
 KFileItemModel::KFileItemModel(QObject* parent) :


@@ -54,7 +58,6 @@ KFileItemModel::KFileItemModel(QObject* parent) :
     m_resortAllItemsTimer(0),
     m_pendingItemsToInsert(),
     m_groups(),
     m_resortAllItemsTimer(0),
     m_pendingItemsToInsert(),
     m_groups(),

-    m_expandedParentsCountRoot(UninitializedExpandedParentsCountRoot),

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


@@ -69,7 +72,7 @@ KFileItemModel::KFileItemModel(QObject* parent) :
     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(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(itemsAdded(KUrl,KFileItemList)), this, SLOT(slotItemsAdded(KUrl,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(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()));


@@ -110,7 +113,8 @@ KFileItemModel::KFileItemModel(QObject* parent) :
 KFileItemModel::~KFileItemModel()
 {
     qDeleteAll(m_itemData);
 KFileItemModel::~KFileItemModel()
 {
     qDeleteAll(m_itemData);

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

 }
 
 void KFileItemModel::loadDirectory(const KUrl& url)
 }
 
 void KFileItemModel::loadDirectory(const KUrl& url)


@@ -120,6 +124,13 @@ void KFileItemModel::loadDirectory(const KUrl& url)
 
 void KFileItemModel::refreshDirectory(const KUrl& url)
 {
 
 void KFileItemModel::refreshDirectory(const KUrl& url)
 {

+    // Refresh all expanded directories first (Bug 295300)
+    QHashIterator<KUrl, KUrl> 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);
 }
 


@@ -159,7 +170,7 @@ bool KFileItemModel::setData(int index, const QHash<QByteArray, QVariant>& value
     QHashIterator<QByteArray, QVariant> it(values);
     while (it.hasNext()) {
         it.next();
     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) {


@@ -181,8 +192,30 @@ bool KFileItemModel::setData(int index, const QHash<QByteArray, QVariant>& value
 
     emit itemsChanged(KItemRangeList() << KItemRange(index, 1), changedRoles);
 
 
     emit itemsChanged(KItemRangeList() << KItemRange(index, 1), changedRoles);
 

-    if (changedRoles.contains(sortRole())) {
-        m_resortAllItemsTimer->start();
+    // Trigger a resorting if the item's correct position has changed. 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))) {
+        // Compare the changed item with its neighbors to see
+        // if an expensive resorting is needed at all.
+        const ItemData* changedItem = m_itemData.at(index);
+        const ItemData* previousItem = (index == 0) ? 0 : m_itemData.at(index - 1);
+        const ItemData* nextItem = (index == m_itemData.count() - 1) ? 0 : m_itemData.at(index + 1);
+
+        if ((previousItem && lessThan(changedItem, previousItem))
+            || (nextItem && lessThan(nextItem, changedItem))) {
+            m_resortAllItemsTimer->start();
+        } else 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();
+        }

     }
 
     return true;
     }
 
     return true;


@@ -241,7 +274,7 @@ QMimeData* KFileItemModel::createMimeData(const QSet<int>& indexes) const
         const int index = it.next();
         const KFileItem item = fileItem(index);
         if (!item.isNull()) {
         const int index = it.next();
         const KFileItem item = fileItem(index);
         if (!item.isNull()) {

-            urls << item.url();
+            urls << item.targetUrl();

 
             bool isLocal;
             mostLocalUrls << item.mostLocalUrl(isLocal);
 
             bool isLocal;
             mostLocalUrls << item.mostLocalUrl(isLocal);


@@ -397,7 +430,7 @@ 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!";
         }
 
         kWarning() << "TODO: Emitting itemsChanged() with no information what has changed!";


@@ -417,28 +450,26 @@ 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 KUrl url = item.url();
+    const KUrl targetUrl = item.targetUrl();

     if (expanded) {
     if (expanded) {

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

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

-        m_expandedDirs.remove(url);
+        m_expandedDirs.remove(targetUrl);

         m_dirLister->stop(url);
 
         m_dirLister->stop(url);
 

+        removeFilteredChildren(KFileItemList() << item);

 
 

-        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;
-        }
-        removeItems(itemsToRemove);
+        const KFileItemList itemsToRemove = childItems(item);
+        removeFilteredChildren(itemsToRemove);
+        removeItems(itemsToRemove, DeleteItemData);

     }
 
     return true;
     }
 
     return true;


@@ -473,7 +504,7 @@ int KFileItemModel::expandedParentsCount(int index) const
 
 QSet<KUrl> KFileItemModel::expandedDirectories() const
 {
 
 QSet<KUrl> KFileItemModel::expandedDirectories() const
 {

-    return m_expandedDirs;
+    return m_expandedDirs.values().toSet();

 }
 
 void KFileItemModel::restoreExpandedDirectories(const QSet<KUrl>& urls)
 }
 
 void KFileItemModel::restoreExpandedDirectories(const QSet<KUrl>& urls)


@@ -548,31 +579,57 @@ void KFileItemModel::applyFilters()
         // 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)) {
+                newFilteredItems.append(item);
+                m_filteredItems.insert(item, itemData);

             }
         }
     }
 
             }
         }
     }
 

-    removeItems(newFilteredItems);
+    removeItems(newFilteredItems, 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 KFileItemList& parentsList)
+{
+    if (m_filteredItems.isEmpty()) {
+        return;
+    }
+
+    // First, we put the parent items into a set to provide fast lookup
+    // while iterating over m_filteredItems and prevent quadratic
+    // complexity if there are N parents and N filtered items.
+    const QSet<KFileItem> parents = parentsList.toSet();
+
+    QHash<KFileItem, ItemData*>::iterator it = m_filteredItems.begin();
+    while (it != m_filteredItems.end()) {
+        const ItemData* parent = it.value()->parent;
+
+        if (parent && parents.contains(parent->item)) {
+            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;


@@ -613,11 +670,11 @@ 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();
 }


@@ -654,7 +711,6 @@ void KFileItemModel::resortAllItems()
         oldUrls.append(itemData->item.url());
     }
 
         oldUrls.append(itemData->item.url());
     }
 

-    m_groups.clear();

     m_items.clear();
 
     // Resort the items
     m_items.clear();
 
     // Resort the items


@@ -663,20 +719,45 @@ void KFileItemModel::resortAllItems()
         m_items.insert(m_itemData.at(i)->item.url(), 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
     kDebug() << "[TIME] Resorting of" << itemCount << "items:" << timer.elapsed();
 
 #ifdef KFILEITEMMODEL_DEBUG
     kDebug() << "[TIME] Resorting of" << itemCount << "items:" << timer.elapsed();


@@ -720,15 +801,19 @@ void KFileItemModel::slotCanceled()
     emit directoryLoadingCanceled();
 }
 
     emit directoryLoadingCanceled();
 }
 

-void KFileItemModel::slotNewItems(const KFileItemList& items)
+void KFileItemModel::slotItemsAdded(const KUrl& 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();
+    KUrl parentUrl;
+    if (m_expandedDirs.contains(directoryUrl)) {
+        parentUrl = m_expandedDirs.value(directoryUrl);
+    } else {
+        parentUrl = directoryUrl;
+        parentUrl.adjustPath(KUrl::RemoveTrailingSlash);
+    }

 
 

+    if (m_requestRole[ExpandedParentsCountRole]) {

         KFileItem item = items.first();
 
         // If the expanding of items is enabled, the call
         KFileItem item = items.first();
 
         // If the expanding of items is enabled, the call


@@ -742,11 +827,15 @@ void KFileItemModel::slotNewItems(const KFileItemList& items)
             return;
         }
 
             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);
         if (parentIndex >= 0 && !m_itemData[parentIndex]->values.value("isExpanded").toBool()) {
             // The parent is not expanded.
         const int parentIndex = m_items.value(parentUrl, -1);
         if (parentIndex >= 0 && !m_itemData[parentIndex]->values.value("isExpanded").toBool()) {
             // The parent is not expanded.


@@ -754,22 +843,21 @@ void KFileItemModel::slotNewItems(const KFileItemList& items)
         }
     }
 
         }
     }
 

+    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()) {


@@ -784,7 +872,7 @@ void KFileItemModel::slotItemsDeleted(const KFileItemList& items)
     dispatchPendingItemsToInsert();
 
     KFileItemList itemsToRemove = items;
     dispatchPendingItemsToInsert();
 
     KFileItemList itemsToRemove = items;

-    if (m_requestRole[ExpandedParentsCountRole] && m_expandedParentsCountRoot >= 0) {
+    if (m_requestRole[ExpandedParentsCountRole]) {

         // Assure that removing a parent item also results in removing all children
         foreach (const KFileItem& item, items) {
             itemsToRemove.append(childItems(item));
         // Assure that removing a parent item also results in removing all children
         foreach (const KFileItem& item, items) {
             itemsToRemove.append(childItems(item));


@@ -793,11 +881,19 @@ void KFileItemModel::slotItemsDeleted(const KFileItemList& items)
 
     if (!m_filteredItems.isEmpty()) {
         foreach (const KFileItem& item, itemsToRemove) {
 
     if (!m_filteredItems.isEmpty()) {
         foreach (const KFileItem& item, itemsToRemove) {

-            m_filteredItems.remove(item);
+            QHash<KFileItem, ItemData*>::iterator it = m_filteredItems.find(item);
+            if (it != m_filteredItems.end()) {
+                delete it.value();
+                m_filteredItems.erase(it);
+            }
+        }
+
+        if (m_requestRole[ExpandedParentsCountRole]) {
+            removeFilteredChildren(itemsToRemove);

         }
     }
 
         }
     }
 

-    removeItems(itemsToRemove);
+    removeItems(itemsToRemove, DeleteItemData);

 }
 
 void KFileItemModel::slotRefreshItems(const QList<QPair<KFileItem, KFileItem> >& items)
 }
 
 void KFileItemModel::slotRefreshItems(const QList<QPair<KFileItem, KFileItem> >& items)


@@ -807,12 +903,12 @@ void KFileItemModel::slotRefreshItems(const QList<QPair<KFileItem, KFileItem> >&
     kDebug() << "Refreshing" << items.count() << "items";
 #endif
 
     kDebug() << "Refreshing" << items.count() << "items";
 #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();
     QListIterator<QPair<KFileItem, KFileItem> > it(items);
     while (it.hasNext()) {
         const QPair<KFileItem, KFileItem>& itemPair = it.next();


@@ -824,10 +920,15 @@ void KFileItemModel::slotRefreshItems(const QList<QPair<KFileItem, KFileItem> >&
 
             // 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(index)->parent));
+            QHash<QByteArray, QVariant>& values = m_itemData[index]->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());


@@ -868,9 +969,11 @@ void KFileItemModel::slotRefreshItems(const QList<QPair<KFileItem, KFileItem> >&
         itemRangeList.append(KItemRange(rangeIndex, rangeCount));
     }
 
         itemRangeList.append(KItemRange(rangeIndex, rangeCount));
     }
 

-    emit itemsChanged(itemRangeList, m_roles);
+    emit itemsChanged(itemRangeList, changedRoles);

 
 

-    resortAllItems();
+    if (changedRoles.contains(sortRole())) {
+        m_resortAllItemsTimer->start();
+    }

 }
 
 void KFileItemModel::slotClear()
 }
 
 void KFileItemModel::slotClear()


@@ -879,14 +982,15 @@ void KFileItemModel::slotClear()
     kDebug() << "Clearing all items";
 #endif
 
     kDebug() << "Clearing all items";
 #endif
 

+    qDeleteAll(m_filteredItems.values());

     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) {


@@ -918,86 +1022,91 @@ 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();
     kDebug() << "===========================================================";
 #ifdef KFILEITEMMODEL_DEBUG
     QElapsedTimer timer;
     timer.start();
     kDebug() << "===========================================================";

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

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

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

 
 #ifdef KFILEITEMMODEL_DEBUG
     kDebug() << "[TIME] Sorting:" << timer.elapsed();
 #endif
 
     KItemRangeList itemRanges;
 
 #ifdef KFILEITEMMODEL_DEBUG
     kDebug() << "[TIME] Sorting:" << timer.elapsed();
 #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_items 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))) {
+                // 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();
-    m_items.reserve(itemDataCount);
-    for (int i = 0; i < itemDataCount; ++i) {
+    // The indexes starting from the first inserted item must be adjusted.
+    m_items.reserve(totalItemCount);
+    for (int i = itemRanges.front().index; i < totalItemCount; ++i) {

         m_items.insert(m_itemData.at(i)->item.url(), i);
     }
 
         m_items.insert(m_itemData.at(i)->item.url(), i);
     }
 

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

 #endif
 }
 
 #endif
 }
 


@@ -1031,7 +1140,7 @@ static KItemRangeList sortedIndexesToKItemRangeList(const QList<int>& sortedNumb
     return result;
 }
 
     return result;
 }
 

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

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


@@ -1054,8 +1163,10 @@ void KFileItemModel::removeItems(const KFileItemList& items)
             QHash<KUrl, int>::iterator it = m_items.find(url);
             m_items.erase(it);
 
             QHash<KUrl, int>::iterator it = m_items.find(url);
             m_items.erase(it);
 

-            ItemData* data = m_itemData.at(index);
-            delete data;
+            if (behavior == DeleteItemData) {
+                delete m_itemData.at(index);
+            }
+

             m_itemData[index] = 0;
         }
     }
             m_itemData[index] = 0;
         }
     }


@@ -1087,44 +1198,36 @@ void KFileItemModel::removeItems(const KFileItemList& items)
 
     m_itemData.erase(m_itemData.end() - indexesToRemove.count(), m_itemData.end());
 
 
     m_itemData.erase(m_itemData.end() - indexesToRemove.count(), m_itemData.end());
 

-    // Step 3: Adjust indexes in the hash m_items. Note that all indexes
-    //         might have been changed by the removal of the items.
+    // Step 3: Adjust indexes in the hash m_items, starting from the
+    //         index of the first removed item.

     const int newItemDataCount = m_itemData.count();
     const int newItemDataCount = m_itemData.count();

-    for (int i = 0; i < newItemDataCount; ++i) {
+    for (int i = itemRanges.front().index; i < newItemDataCount; ++i) {

         m_items.insert(m_itemData.at(i)->item.url(), i);
     }
 
         m_items.insert(m_itemData.at(i)->item.url(), i);
     }
 

-    if (count() <= 0) {
-        m_expandedParentsCountRoot = UninitializedExpandedParentsCountRoot;
-    }
-

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

-QList<KFileItemModel::ItemData*> KFileItemModel::createItemDataList(const KFileItemList& items) const
+QList<KFileItemModel::ItemData*> KFileItemModel::createItemDataList(const KUrl& 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 = m_items.value(parentUrl, -1);
+    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->values = retrieveData(item, parentItem);
+        itemData->parent = parentItem;

         itemDataList.append(itemData);
     }
 
         itemDataList.append(itemData);
     }
 


@@ -1145,9 +1248,8 @@ void KFileItemModel::removeExpandedItems()
 
     // The m_expandedParentsCountRoot may not get reset before all items with
     // a bigger count have been removed.
 
     // The m_expandedParentsCountRoot may not get reset before all items with
     // a bigger count have been removed.

-    removeItems(expandedItems);
+    removeItems(expandedItems, DeleteItemData);

 
 

-    m_expandedParentsCountRoot = UninitializedExpandedParentsCountRoot;

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


@@ -1210,34 +1312,29 @@ 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]) {
-        const bool isLink = item.isLink();
-        data.insert("isLink", isLink);
+    if (m_requestRole[IsLinkRole] && item.isLink()) {
+        data.insert(sharedValue("isLink"), 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[DateRole]) {
     }
 
     if (m_requestRole[DateRole]) {


@@ -1245,19 +1342,19 @@ QHash<QByteArray, QVariant> KFileItemModel::retrieveData(const KFileItem& item)
         // 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);
         // 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());
+        data.insert(sharedValue("date"), dateTime.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]) {
     }
 
     if (m_requestRole[DestinationRole]) {


@@ -1265,7 +1362,7 @@ QHash<QByteArray, QVariant> KFileItemModel::retrieveData(const KFileItem& item)
         if (destination.isEmpty()) {
             destination = QLatin1String("-");
         }
         if (destination.isEmpty()) {
             destination = QLatin1String("-");
         }

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

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


@@ -1288,48 +1385,29 @@ 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);
-    }
-
-    if (m_requestRole[IsExpandedRole]) {
-        data.insert("isExpanded", false);
+        data.insert(sharedValue("path"), path);

     }
 
     }
 

-    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 = parent->values["expandedParentsCount"].toInt() + 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;


@@ -1339,7 +1417,7 @@ bool KFileItemModel::lessThan(const ItemData* a, const ItemData* b) const
 {
     int result = 0;
 
 {
     int result = 0;
 

-    if (m_expandedParentsCountRoot >= 0 && a->parent != b->parent) {
+    if (a->parent != b->parent) {

         const int expansionLevelA = a->values.value("expandedParentsCount").toInt();
         const int expansionLevelB = b->values.value("expandedParentsCount").toInt();
 
         const int expansionLevelA = a->values.value("expandedParentsCount").toInt();
         const int expansionLevelB = b->values.value("expandedParentsCount").toInt();
 


@@ -1552,6 +1630,11 @@ bool KFileItemModel::useMaximumUpdateInterval() const
     return !m_dirLister->url().isLocalFile();
 }
 
     return !m_dirLister->url().isLocalFile();
 }
 

+static bool localeAwareLessThan(const QChar& c1, const QChar& c2)
+{
+    return QString::localeAwareCompare(c1, c2) < 0;
+}
+

 QList<QPair<int, QVariant> > KFileItemModel::nameRoleGroups() const
 {
     Q_ASSERT(!m_itemData.isEmpty());
 QList<QPair<int, QVariant> > KFileItemModel::nameRoleGroups() const
 {
     Q_ASSERT(!m_itemData.isEmpty());


@@ -1561,7 +1644,6 @@ 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;


@@ -1577,31 +1659,31 @@ 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;
+                if (lettersAtoZ.empty()) {
+                    for (char c = 'A'; c <= 'Z'; ++c) {
+                        lettersAtoZ.push_back(QLatin1Char(c));
+                    }
+                }
+
+                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) {


@@ -1659,12 +1741,6 @@ QList<QPair<int, QVariant> > KFileItemModel::dateRoleGroups() const
 
     const QDate currentDate = KDateTime::currentLocalDateTime().date();
 
 
     const QDate currentDate = KDateTime::currentLocalDateTime().date();
 

-    int yearForCurrentWeek = 0;
-    int currentWeek = currentDate.weekNumber(&yearForCurrentWeek);
-    if (yearForCurrentWeek == currentDate.year() + 1) {
-        currentWeek = 53;
-    }
-

     QDate previousModifiedDate;
     QString groupValue;
     for (int i = 0; i <= maxIndex; ++i) {
     QDate previousModifiedDate;
     QString groupValue;
     for (int i = 0; i <= maxIndex; ++i) {


@@ -1682,20 +1758,9 @@ QList<QPair<int, QVariant> > KFileItemModel::dateRoleGroups() const
 
         const int daysDistance = modifiedDate.daysTo(currentDate);
 
 
         const int daysDistance = modifiedDate.daysTo(currentDate);
 

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

         QString newGroupValue;
         if (currentDate.year() == modifiedDate.year() && currentDate.month() == modifiedDate.month()) {
         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) {
+            switch (daysDistance / 7) {

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


@@ -1704,7 +1769,7 @@ QList<QPair<int, QVariant> > KFileItemModel::dateRoleGroups() const
                 }
                 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");


@@ -1727,7 +1792,7 @@ QList<QPair<int, QVariant> > KFileItemModel::dateRoleGroups() const
                 } 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)"));
                 } else if (daysDistance <= 7 * 2) {
                 } 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)"));
                 } 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 = modifiedTime.toString(i18nc("@title:group Date: %B is full month name in current locale, and %Y is full year number", "One Week Ago (%B, %Y)"));

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


@@ -1948,8 +2013,16 @@ 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.


@@ -1958,6 +2031,19 @@ void KFileItemModel::determineMimeTypes(const KFileItemList& items, int timeout)
     }
 }
 
     }
 }
 

+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
 {
     if (m_items.count() != m_itemData.count()) {
 bool KFileItemModel::isConsistent() const
 {
     if (m_items.count() != m_itemData.count()) {