If you try to re-attach glX contexts to different
one find two server-crashing bugs.
Swapping front/back buffers on a window that does
not currently have an attached context crashes X.
Re-attaching an existing context to another window
and using it crashes X.
This works fine on an SGI.
I get different results with ATI DRI. It does not
crash, but gives strange artifacts.
This also crashes nVidia. Even the new Xig server
gets this wrong (but at least doesn't crash)
Why do it? I want to render to two windows
using the same OpenGL state.
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