QtWidgets: replace uses of inefficient QList<QPair>s with QVectors

These QPairs are larger than a void*, so holding them in QLists
is needlessly inefficient. Worse, the code could come to depend
on the fragile property of (inefficient) QLists that references
to elements therein never are invalidated.

Fix by holding them in QVector instead.

Change-Id: I3c205f5326cfd96482563078bdca1747d718457f
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/widgets/itemviews/qtreeview_p.h b/src/widgets/itemviews/qtreeview_p.h
index 9d2f496c5d..a3619ce13b 100644
--- a/src/widgets/itemviews/qtreeview_p.h
+++ b/src/widgets/itemviews/qtreeview_p.h
@@ -54,6 +54,7 @@
 #include "private/qabstractitemview_p.h"
 #include <QtCore/qvariantanimation.h>
 #include <QtCore/qabstractitemmodel.h>
+#include <QtCore/qvector.h>
 
 #ifndef QT_NO_TREEVIEW
 
@@ -164,7 +165,7 @@ public:
     QRect itemDecorationRect(const QModelIndex &index) const;
 
 
-    QList<QPair<int, int> > columnRanges(const QModelIndex &topIndex, const QModelIndex &bottomIndex) const;
+    QVector<QPair<int, int> > columnRanges(const QModelIndex &topIndex, const QModelIndex &bottomIndex) const;
     void select(const QModelIndex &start, const QModelIndex &stop, QItemSelectionModel::SelectionFlags command);
 
     QPair<int,int> startAndEndColumns(const QRect &rect) const;