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cairo-xlib-surface needs to do the Xlib register extension hack so
that it can listen for a Display close event. When it gets that, it
needs to run through its caches and eliminate anything associated with
that display.
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The caches need to be invalidated at font destruction time.
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Splines are not dashed.
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The polygon tessellation routine has problems. It appears that the
following paper has the right answers:
http://cm.bell-labs.com/cm/cs/doc/93/2-27.ps.gz
[Hobby93c] John D. Hobby, Practical Segment Intersection with
Finite Precision Output, Computation Geometry Theory and
Applications, 13(4), 1999.
Recent improvements to make the intersection code more robust (using
128-bit arithmetic where needed), have exposed some of the weakness in
the current tessellation implementation. So, for now, filling some
polygons will cause "leaking" until we implement Hobby's algorithm.
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cairo_show_text is not updating the current point by the string's advance values.
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