Fix layout-issues when sorting by roles that are changed

When sorting is enabled for a role that gets changed e.g. because
a value like the MIME-type is determined asynchronously, then the
layout might get messed up.

slotItemsMoved() has been adjusted to invalidate the sizehint-cache
and to update the group-headers.

BUG: 285542
FIXED-IN: 4.8.0

1 files changed, 6 insertions, 4 deletions

diff --git a/src/kitemviews/kitemlistsizehintresolver.cpp b/src/kitemviews/kitemlistsizehintresolver.cpp
index 00eb79bdd..0520fac04 100644
--- a/src/kitemviews/kitemlistsizehintresolver.cpp
+++ b/src/kitemviews/kitemlistsizehintresolver.cpp
@@ -60,11 +60,13 @@ void KItemListSizeHintResolver::itemsRemoved(int index, int count)
     m_sizeHintCache.erase(begin, end);
 }
 
-void KItemListSizeHintResolver::itemsMoved(int from, int to, int count)
+void KItemListSizeHintResolver::itemsMoved(int index, int count)
 {
-    Q_UNUSED(from);
-    Q_UNUSED(to);
-    Q_UNUSED(count);
+    while (count) {
+        m_sizeHintCache[index] = QSizeF();
+        ++index;
+        --count;
+    }
 }
 
 void KItemListSizeHintResolver::itemsChanged(int index, int count, const QSet<QByteArray>& roles)