QmlDesigner: extend the area where an item can be droped

src/plugins/qmldesigner/components/formeditor/dragtool.cpp

@@ -178,6 +178,9 @@ FormEditorItem* DragTool::calculateContainer(const QPointF &point, FormEditorIte
          if (formEditorItem && formEditorItem != currentItem && formEditorItem->isContainer())
              return formEditorItem;
     }
+
+    if (scene()->rootFormEditorItem()->boundingRect().adjusted(-100, -100, 100, 100).contains(point))
+        return scene()->rootFormEditorItem();
     return 0;
 }