widgets: Re-calculate focus frame style option after setting new geometry

Fixes: QTBUG-83019
Change-Id: I75d3d93732cb0c5a5b7350f19f0227998bda4791
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
(cherry picked from commit bd78753d62)
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

src/widgets/widgets/qfocusframe.cpp

@@ -99,6 +99,8 @@ void QFocusFramePrivate::updateSize()
         return;
 
     q->setGeometry(geom);
+
+    opt.rect = q->rect();
     QStyleHintReturnMask mask;
     if (q->style()->styleHint(QStyle::SH_FocusFrame_Mask, &opt, q, &mask))
         q->setMask(mask.region);