Xlib doesn't like surfaces > display resolution. See patch.
Created attachment 12041 [details] [review] Reduce size of test surfaces
There will always be some size that is too large for any particular output. Rather than changing the test size (and if we do that at run time we would make the results not directly comparable between backends) we should just skip tests that do not fit. And the test/perf-suite has already been fixed to do so.
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