[PATCH 0/1] MR8673: win32u: Also flush the GL drawable if the client surface is offscreen.

[Rémi Bernon]

Making sure the driver will present the surface for games drawing to the
front buffer.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=58515
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=58534

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https://gitlab.winehq.org/wine/wine/-/merge_requests/8673