Ben,

Your commit 1336989ec breaks front buffer rendering on Xserver < 1.7.

Shouldn't the change that silently added a fake front attachment have 
been accompanied by a bump in SERVER_DRI2_MINOR_VERSION to signal a new 
capability? Then we could have inserted some conditional code...

The way tfp is handled in the xorg state tracker is that when it detects 
a fake front request on a pixmap it actually hands it the real front, 
which makes the code work also on older servers.

/Thomas




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