Fix crash when disabling "Show in groups"

The problem was that items are removed from m_visibleGroups while
a QMutableHashIterator iterates over this hash, such that the iterator
can become invalid. The solution is to use a QHashIterator instead,
which takes a copy of the hash. Therefore, it is not affected if
m_visibleGroups is modified in any way.

BUG: 323248
FIXED-IN: 4.11.1
REVIEW: 111919

1 files changed, 4 insertions, 2 deletions

diff --git a/src/kitemviews/kitemlistview.cpp b/src/kitemviews/kitemlistview.cpp
index 0c3183cd5..7f1526151 100644
--- a/src/kitemviews/kitemlistview.cpp
+++ b/src/kitemviews/kitemlistview.cpp
@@ -1237,8 +1237,10 @@ void KItemListView::slotGroupedSortingChanged(bool current)
     if (m_grouped) {
         updateGroupHeaderHeight();
     } else {
-        // Clear all visible headers
-        QMutableHashIterator<KItemListWidget*, KItemListGroupHeader*> it (m_visibleGroups);
+        // Clear all visible headers. Note that the QHashIterator takes a copy of
+        // m_visibleGroups. Therefore, it remains valid even if items are removed
+        // from m_visibleGroups in recycleGroupHeaderForWidget().
+        QHashIterator<KItemListWidget*, KItemListGroupHeader*> it(m_visibleGroups);
         while (it.hasNext()) {
             it.next();
             recycleGroupHeaderForWidget(it.key());