[cairo] Bad bug when filling clipped area

[cu]

Please see this attached code sample. When running it using cairo 1.9.6
(built for MacOS), the clipped area fill is completely wrong. Changing
the value X of filled squares can fix the issue, so this is somehow
value-driven.

Having a fix for this would be great - as this issue manifests itself in
a few cases and really breaks the output.
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