Clicking on a disabled ListView's delegate breaks mouse interaction

1. Run the attached .qml in qmlviewer
2. Click on the bottom rectangle
3. Note it changes color on every click
4. Click a list item
5. Console logs "QGraphicsItem::ungrabMouse: not a mouse grabber"
6. Click on bottom rectangle
7. No response

The ungrabMouse function in src/gui/graphicsview/qgraphicsscene.cpp seems to be fired but as there was no valid item to be clicked on, it just returns. Further clicks are no longer possible.