Bug with QGraphicsDropShadowEffect when resizing

[remmos]

Hello everyone ...

When I maximize my - in a layout arranged - QGraphicsWidget with a QGraphicsDropShadowEffect enabled effect, the "layout-manager" doesn't call the "paint" method of the child-elemets correct.

I've 3 QGraphicsWidgets, each in a horizontal-QGraphicsLinearLayout, in one vertical QGraphicsLinearLayout.
(1 col. - 3 rows)

First row is a "MenuBar" with a QGraphicsDropShadowEffect enabled.
2nd row is empty (std. QGraphicsWidget - no subclass)
3rd row is a "Footer" with QGraphicsDropShadowEffect enabled.

On maximizing, the first row (MenuBar) grows up 100% of width

But the 3rd row does not ... only sometimes ... e.g when I "leaf" the window and come back

I tried qDebug and it seems the "paint" method is no called correctly on maximizing ...

What now?

[remmos]

My debug Output:

bq. Geometry Header: QRectF(0,0 1022x150)
Geometry Footer: QRectF(0,741 1022x25)

Window will be maximized !
Geometry Header: QRectF(0,0 1918x150)
<-- here is the first gap ... now i'll "change the active window" and come back -->
Geometry Header: QRectF(0,0 1918x150)
Geometry Footer: QRectF(0,991 1918x25) // <-- Now the width is correct ...

Geometry Header: QRectF(0,0 1918x150) // <--- Window-Changed
Geometry Footer: QRectF(0,991 1918x25) // <--- Window-Changed

Window will not be maximized!
Geometry Header: QRectF(0,0 1022x150)
<-- here is the gap again - the footer is to wide ... -->
Geometry Header: QRectF(0,0 1022x150) // <-- after "active-window change repaint"
Geometry Footer: QRectF(0,741 1022x25) // now it fits ...

Someone any ideas?