[cairo] clipping bug

[Radek Doulík]

Hi,

I ran to a clipping bug. It happens when everything is clipped out and
when _cairo_clip_intersect_mask has to be used. At one point
XCreatePixmap is called with zero width and height, which generates
BadValue X error.

I am attaching patch for cairo/test directory with clip-all test which
demonstrates that problem. Note that it enables X synchronization in
cairo-test.c.

Perhaps someone who knows the clipping code can cook a quick fix.

Cheers
Radek

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