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Jan Arve Saether de1b98e9c1 Fallback to QWidget::grab() if QScreen::grabWindow() fails.
QScreen::grabWindow() is not always reliable because it grabs from the
framebuffer. (The window might then be covered by other windows, e.g.
"Stays on top"-Windows, popups etc).
If QScreen::grabWindow() fails we therefore fallback to
QWidget::grab(). This will not grab from the frame buffer, but it will
ask the widget to render itself (with its current state) to a pixmap
and return it.
QWidget::grab() should usually return the expected pixmap, and the
pixmap it gives is not subject to the state of the window manager.

This means that both QScreen::grabWindow() *and* QWidget::grab()
must produce an unexpected pixmap in order for the test to fail.

Change-Id: I276554155bb1e5b510d2a2d43628d91669464fe2
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>
2014-02-07 23:52:49 +01:00
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examples widgets/mainwindows/mainwindow example: Use mouse release event for dock title. 2014-02-07 22:12:10 +01:00
lib Initial import from the monolithic Qt. 2011-04-27 12:05:43 +02:00
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src Windows file dialog: Clean up thread manually. 2014-02-07 23:52:49 +01:00
tests Fallback to QWidget::grab() if QScreen::grabWindow() fails. 2014-02-07 23:52:49 +01:00
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