This isn't true.
What "clobbering" is allowed can be inferred from the GLX specification. If you overlook DBE for a second, I believe we are meeting the requirements of the spec, so I wouldn't say we're "broken".
Consider when a diagonal line is drawn by Xlib across the active GL window, with pages flipped.
--> Xlib draws in the "back buffer"
--> Shadow copies the bounding box of the line to the front buffer, including *all* of the backbuffer.
What you really want is just a line to be drawn in the front buffer, but in fact you get a whole lot of garbage with it.
A common place things like this occur is in opaque window moves -- if you move the 3d window when pages are flipped, its contents are replaced with whatever's in the backbuffer.
A solution to this is to get Xlib and GL to agree which is the front buffer and always have Xlib draw into that & copy to the backbuffer.
Keith
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