fixed: race condition during unfolding animation

AppKit/CPOutlineView.j

@@ -1132,6 +1132,11 @@ var CPOutlineViewCoalesceSelectionNotificationStateOff  = 0,
 */
 - (void)reloadItem:(id)anItem reloadChildren:(BOOL)shouldReloadChildren
 {
+    if (_rowsAnimation && [_rowsAnimation isAnimating])
+    {
+        [_rowsAnimation stopAnimation];
+        [self animationDidEnd:_rowsAnimation];
+    }
 
     _pendingItemToClean = [];
     _itemAddedDuringLastLoading = [];