glx: Invalidate buffers after binding a drawable
glx: Invalidate buffers after binding a drawable

If the server doesn't send invalidate events, we may miss a
resize before the rendering starts.  Invalidate the buffers now
so the driver will recheck before rendering starts.

https://bugs.freedesktop.org/show_bug.cgi?id=29984
https://bugs.freedesktop.org/show_bug.cgi?id=30155

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