A window with a renderToTexture child uses the OpenGL path, but when
we open a popup or dialog, that uses the raster compositor, which opens
a separate surface. This patch fixes two issues when combining GL rendering
with the raster compositor:
1. GL-rendered widgets were counted as part of the raster-rendered region,
meaning that we did not punch a hole in the raster surface.
2. We did not destroy the surface when no longer needed.
Task-number: QTBUG-41467
Change-Id: I2a2a0e860cce065b330df1c864d51fd02103aa1b
Reviewed-by: Christian Stromme <christian.stromme@theqtcompany.com>
Reviewed-by: BogDan Vatra <bogdan@kde.org>
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@theqtcompany.com>
Reviewed-by: Laszlo Agocs <laszlo.agocs@theqtcompany.com>
8015ffef1e