fix listview insert child at index bug

cocos/ui/UILayout.cpp

@@ -987,10 +987,14 @@ LayoutManager* Layout::createLayoutManager()
 
 void Layout::doLayout()
 {
+    
     if (!_doLayoutDirty)
     {
         return;
     }
+    
+    sortAllChildren();
+
     LayoutManager* executant = this->createLayoutManager();
     
     if (executant)

cocos/ui/UIWidget.cpp

@@ -261,10 +261,7 @@ void Widget::setContentSize(const cocos2d::Size &contentSize)
     {
         _contentSize = getVirtualRendererSize();
     }
-    else
-    {
-        _contentSize = contentSize;
-    }
+    
     if (_running)
     {
         Widget* widgetParent = getWidgetParent();