Fixed QTreeView trying to animate when parent item has no child

We now check that the item has children before animating.

Reviewed-by: Alexis

2 files changed, 17 insertions, 3 deletions

diff --git a/src/gui/itemviews/qtreeview.cpp b/src/gui/itemviews/qtreeview.cpp
index 210534e..d597f5c 100644
--- a/src/gui/itemviews/qtreeview.cpp
+++ b/src/gui/itemviews/qtreeview.cpp
@@ -2908,15 +2908,15 @@ void QTreeViewPrivate::expand(int item, bool emitSignal)
     layout(item);
     q->setState(oldState);
 
+    if (model->canFetchMore(index))
+        model->fetchMore(index);
     if (emitSignal) {
         emit q->expanded(index);
 #ifndef QT_NO_ANIMATION
-        if (animationsEnabled)
+        if (animationsEnabled && model->hasChildren(index))
             beginAnimatedOperation();
 #endif //QT_NO_ANIMATION
     }
-    if (model->canFetchMore(index))
-        model->fetchMore(index);
 }
 
 void QTreeViewPrivate::collapse(int item, bool emitSignal)
diff --git a/tests/auto/qtreeview/tst_qtreeview.cpp b/tests/auto/qtreeview/tst_qtreeview.cpp
index 91b2cc5..da58725 100644
--- a/tests/auto/qtreeview/tst_qtreeview.cpp
+++ b/tests/auto/qtreeview/tst_qtreeview.cpp
@@ -172,6 +172,7 @@ private slots:
     void expandAndCollapse_data();
     void expandAndCollapse();
     void expandAndCollapseAll();
+    void expandWithNoChildren();
     void keyboardNavigation();
     void headerSections();
     void moveCursor_data();
@@ -1548,6 +1549,19 @@ void tst_QTreeView::expandAndCollapseAll()
 //    QCOMPARE(collapsedSpy.count(), count);
 }
 
+void tst_QTreeView::expandWithNoChildren()
+{
+    QTreeView tree;
+    QStandardItemModel model(1,1);
+    tree.setModel(&model);
+    tree.setAnimated(true);
+    tree.doItemsLayout();
+    //this test should not output warnings
+    tree.expand(model.index(0,0));
+}
+
+
+
 void tst_QTreeView::keyboardNavigation()
 {
     const int rows = 10;