[Bug 80033] [sna] Occasional artifacts on window borders (theme dependent)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80033

--- Comment #22 from b3nmore at googlemail.com ---
(In reply to comment #20)
> If you are certain it is a repeating pattern, then it the BLT being loaded
> up with garbage. The BLT takes an 8x8 pattern to be repeated, so it that
> matches the repeat distance I know it is still junk being fed into that
> command. :|
> 
> Have you refined your test? Could you?

Never saw a periodicity longer than 8px; sometimes shorter, but that could be
just because the garbage has a pattern.

I've replaced the offending xpm with a 3px/4px wide one. With the 3px one I
couldn't see any stripes, only the right edge of the bottom border shows
sometimes a wrong pixel. With 4px it's basically the same as with 2px (maybe a
bit less frequent) and a period of 8px again.

And another observation (tested with commit
d49f53cc00258e3b1e1a898c02e219b336716002, because it's much easier to
reproduce): The stripes appear if the bottom border is >1009px (or 1013 if one
includes the corner pixmaps).

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