Fix alternate backgrounds when enabling grouping

Up to now the alternating backgrounds just have been calculated by
checking whether the item index is odd. This does not work well when
grouping is enabled: In this case the alternate background color
of the first item of a group should stay consistent.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/kitemviews/kitemlistviewlayouter_p.h b/src/kitemviews/kitemlistviewlayouter_p.h
index 017f520fe..0d7c0d040 100644
--- a/src/kitemviews/kitemlistviewlayouter_p.h
+++ b/src/kitemviews/kitemlistviewlayouter_p.h
@@ -139,6 +139,15 @@ public:
 
     void markAsDirty();
 
+#ifndef QT_NO_DEBUG
+    /**
+     * @return True if the layouter has been marked as dirty and hence has
+     *         not called yet doLayout(). Is enabled only in the debugging
+     *         mode, as it is not useful to check the dirty state otherwise.
+     */
+    bool isDirty();
+#endif
+
 private:
     void doLayout();
     void updateVisibleIndexes();