[cairo] [PATCH] Improve handling of contexts with finished surface

[Uli Schlachter]

Hi everyone,

in response to Bug 68014 "Writing on a finished surface." [0], I came up with
the attached patches.

The first patch enhances the api-special-cases test so that it also tests the
behavior of functions receiving a cairo_t* and the other patches fix various
problems that these new tests uncovered.

I would be happy about comments on these patches.

Cheers,
Uli

[0]: https://bugs.freedesktop.org/show_bug.cgi?id=68014
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