[Qt-interest] Focus Bug In 4.6 GraphicsView?

[Cheung Yik Pang]

Hi all,

I discovered a behavior change in the 4.6 git head against the 4.5 branch.

The attached test program starts by showing green widget in a parent 
widget.  Then a 3-second timer will trigger hide() on the green widget, 
and shows a view.

The view contains a scene with a blue rectangle at the center.  In 
focusInEvent() of the view, a onFocus() signal is emitted to trigger the 
obtainFocus() slot in the scene, to set the focus to the blue rectangle 
by setFocusItem().

In 4.5.x, setFocusItem() will succeed and focusItem() returns the 
rectangle item. 

In 4.6, setFocusItem() will fail, unless 
viewportEvent(QEvent::WindowActivate) is called in the view before 
emitting onFocus() signal.  If viewportEvent() is omitted, the scene 
will have focus, but one cannot set a focus item to the scene.

Anyone has the same experience?

Thanks in advance.

Regards,
Cheung
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