Merge remote-tracking branch 'origin/dev' into wip/cmake

 Conflicts:
        src/corelib/Qt5CoreConfigExtras.cmake.in
        src/corelib/Qt5CoreMacros.cmake
        src/dbus/Qt5DBusConfigExtras.cmake.in
        src/widgets/Qt5WidgetsConfigExtras.cmake.in

Change-Id: Ib782f3b177c38b2cce83beebe15be9c0baa578f7

1 files changed, 4 insertions, 3 deletions

diff --git a/src/widgets/itemviews/qtreewidget.cpp b/src/widgets/itemviews/qtreewidget.cpp
index 4908ad6ad2..3bd77b340b 100644
--- a/src/widgets/itemviews/qtreewidget.cpp
+++ b/src/widgets/itemviews/qtreewidget.cpp
@@ -48,6 +48,8 @@
 #include <private/qwidgetitemdata_p.h>
 #include <private/qtreewidgetitemiterator_p.h>
 
+#include <QtCore/private/qduplicatetracker_p.h>
+
 #include <algorithm>
 
 QT_BEGIN_NAMESPACE
@@ -3175,13 +3177,12 @@ QList<QTreeWidgetItem*> QTreeWidget::selectedItems() const
     const QModelIndexList indexes = selectionModel()->selectedIndexes();
     QList<QTreeWidgetItem*> items;
     items.reserve(indexes.count());
-    QSet<QTreeWidgetItem *> seen;
+    QDuplicateTracker<QTreeWidgetItem *> seen;
     seen.reserve(indexes.count());
     for (const auto &index : indexes) {
         QTreeWidgetItem *item = d->item(index);
-        if (item->isHidden() || seen.contains(item))
+        if (item->isHidden() || seen.hasSeen(item))
             continue;
-        seen.insert(item);
         items.append(item);
     }
     return items;