This reverts commit 341bfcd1ea.
As it turns out there might be use cases where we want to have proper
windowing system event integration with glib dispatcher via g_source_attach().
For example with gtk_dialog_run, where GTK blocks in a recursive main loop.
We want to continue dispatcing our windowing system events during this nested
event loop. Not having a proper glib integration can result in rendering issues,
e.g. when resizing parent window via mouse while GTK-based dialog is shown. Can
be seen on examples/widgets/richtext/textedit/ -> Format (from menu) -> "Color..."
The issue from 341bfcd1ea actually should be fixed inside XCB platform plugin,
by improving integration with event dispatcher. That is handled in follow-up patches.
Change-Id: Icabc6d841a554aefbdd460765a3165d22e65f651
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
8315acfb16