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xwayland/eglstream: Force glFinish() after post_damage()

Olivier Fourdan requested to merge ofourdan/xserver:issue1171 into master

The buffer we attach to the surface with EGLstream might not be fully rendered when resizing windows.

Make sure the previous EGL commands are complete before returning from xwl_glamor_eglstream_post_damage().

This is definitely a big ugly hammer, but a glFlush() is not sufficient to get rid of the visual glitches.

Closes: #1171 (closed)

Goes on top/after !646 (merged)

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