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Fixes the following problem: With DRI3 enabled, run glxgears with LIBGL_DRI3_DISABLE=1, make it fullscreen and press Escape while it's still fullscreen. This could result in dri2_flipping not getting cleared, spuriously preventing apps using DRI3 from flipping. (Ported from radeon commit e87365117acbd80b7d80fbb5eb30890ef7153291) Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
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