[cairo] Question regarding cairo, freetype and multi-threaded execution.

[Joseph Adamski-Smith]

I was able to reproduce it quite easily in my server environment.

I added an infinite loop in af_latin_hints_compute_edges in freetype. Then
if cairo_text_extents is called the thread will be stuck in that function.
Now if another thread calls cairo_text_extents with different font this new
thread will also enter the function and both will be acting on the same
hinter.

Thanks
Joseph
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