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The problem was that we did an accelerated move, i.e. scrolled the
widget's contents in the backing store and repainted the old area. We
cannot do this trick when the widget has been invalidated (show(),
resize()). In this case the widget had never been painted, so we
basically scrolled the content of its parent and the widget itself
appeared as invisible.
Auto-test included.
Task-number: 255117
Reviewed-by: Paul
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Reviewed-by: Trust Me
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Updates triggered by the line edit itself, i.e. cursor blinking, are not
processed after the top-level is resized. This is yet another problem
caused by the event dispatcher on Windows (Qt posted events are not sent
during top-level resize, task 146849). We added a work-around for that
particular case by posting an event via Windows, but the widget is not
visible on the screen (hidden from Windows' POV) so it'll never be posted.
And of course then we'll never receive it and the backing store is not
synced. This work-around is therefore useless for widgets that are
not visible on the screen.
However, not receiving update requests while resizing the top-level
(in this case QGraphicsView), is not a problem for embedded widgets
because all items and hence the proxied widgets are repainted by
graphics view anyways.
Task-number: 252400
Reviewed-by: Olivier
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Addendum to change 9b674ddcea7c0ff7912f185474b7d98bc83bd39f.
The problem was that QWidget::paintEngine() (pure virtual) was
called while being in the destructor. The use-case itself
(see above change) is very very corner case, but still,
it shouldn't crash.
Reviewed-by: bnilsen
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QGLWidget does not support partial updates unless the context is
single buffered and auto-fill background is disabled. The problem
was that QPaintEvent::region() returned the requested update region
without taking into account the limitation of QGLWidget. If QGLWidget
doesn't support partial updates, it means everything has to be updated,
and QPaintEvent::region() must return the whole widget rect.
Auto test included.
Task-number: 241785
Reviewed-by: Trond
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