QEventDispatcherWin32: rework sending of posted events

Since its initial implementation, QEventDispatcherWin32 manages a
delivery of the posted events from the window procedure through
WM_QT_SENDPOSTEDEVENTS message. That makes the implementation quite
difficult and unclear. As a result, posted events get stalled,
in case of using nested event loops or other recursion.

The proposed solution is to send posted events at the beginning of
processEvents() only once per iteration of the event loop. However,
in case of using a foreign event loop (e.g. by opening a native
modal dialog), we should leave the emission in the window procedure,
as we don't control its execution.

Task-number: QTBUG-74564
Change-Id: Ib7ce85b65405af6124823dda1451d1370aed9b1a
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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