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Since we can't use an input and visual transparent widget, like a
GtkGrid, we have to implement input forwarding in the QWindow.
Using a Qt5Widget directly results in other problems on Qt 5.12+,
like these warnings (depending on the tested Qt::WA_* flags):
* Attempted flush to non-raster surface QWidgetWindow(0xa386c10,
name="QWidgetClassWindow") of type QSurface::OpenGLSurface
(consider using Qt::WA_PaintOnScreen to exclude from
backingstore sync)
* QWidget::paintEngine: Should no longer be called
So the current QWidget::createWindowContainer has to stay and key
and mouse handling must be implemented as in Qt5Widget. And the
QWindow is strangely not accessible through the windowHandle() of
the container QWwidget.
As a result this patch is mostly boilerplate code, publishing the
Qt5Widget mouse and key handling as static functions.
Change-Id: I5be5f5fa1379c6bdefab0f96604251801c252b38
Reviewed-on: https://gerrit.libreoffice.org/73566
Tested-by: Jenkins
Reviewed-by: Jan-Marek Glogowski <glogow@fbihome.de>
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