From: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Date: Mon, 15 Feb 2021 16:34:01 +0000 (+0100)
Subject: [FileItemRolesUpdater] Reserve space in two temporary lists
X-Git-Url: https://cloud.milkyroute.net/gitweb/dolphin.git/commitdiff_plain/7c0b5c08cc97eded7755ca5cef9c7e5ba5c15537

[FileItemRolesUpdater] Reserve space in two temporary lists

Reserve sufficient space to avoid reallocation later. Overallocating
actually requires less memory than growing and copying it, and it
is freed immediately after anyway.
---

diff --git a/src/kitemviews/kfileitemmodelrolesupdater.cpp b/src/kitemviews/kfileitemmodelrolesupdater.cpp
index 0554bff60..d18387f51 100644
--- a/src/kitemviews/kfileitemmodelrolesupdater.cpp
+++ b/src/kitemviews/kfileitemmodelrolesupdater.cpp
@@ -954,6 +954,8 @@ void KFileItemModelRolesUpdater::updateChangedItems()
 
     QList<int> visibleChangedIndexes;
     QList<int> invisibleChangedIndexes;
+    visibleChangedIndexes.reserve(m_changedItems.size());
+    invisibleChangedIndexes.reserve(m_changedItems.size());
 
     // Iterate over a const copy because items are deleted within the loop
     const auto changedItems = m_changedItems;