From 6da6b7099d4e0b49329793e4b90703ec3d868048 Mon Sep 17 00:00:00 2001
From: Frank Reininghaus <frank78ac@googlemail.com>
Date: Wed, 22 Sep 2010 10:19:59 +0200
Subject: [PATCH] QTreeView: do not scroll to top if last item is removed

When the last item is the current item and is removed,
QTreeViewPrivate::updateScrollBars() is called after QTreeViewPrivate's
viewItems member is cleared. This commit makes sure that viewItems is
restored by calling QTreeView::doItemsLayout() in this case, preventing
that the scroll bar range is set to zero temporarily and the view is
scrolled to the top unexpectedly (this was a regression in 4.7.0:
QTBUG-13567).

Merge-request: 2481
Reviewed-by: Olivier Goffart <olivier.goffart@nokia.com>

diff --git a/src/gui/itemviews/qtreeview.cpp b/src/gui/itemviews/qtreeview.cpp
index b797776..40b51fe 100644
--- a/src/gui/itemviews/qtreeview.cpp
+++ b/src/gui/itemviews/qtreeview.cpp
@@ -3435,6 +3435,10 @@ void QTreeViewPrivate::updateScrollBars()
     if (!viewportSize.isValid())
         viewportSize = QSize(0, 0);
 
+    if (viewItems.isEmpty()) {
+        q->doItemsLayout();
+    }
+
     int itemsInViewport = 0;
     if (uniformRowHeights) {
         if (defaultItemHeight <= 0)