[cairo] deleting hash objects while iterating

[Keith Packard]

I discovered that _cairo_hash_table_foreach walks over the hash table
without preventing it from being resized as a result of deletions
occuring from the callback.

Kinda nasty when you're trying to free everything from a hash table.

It was also easy to fix; just prevent the table from being resized while
iterating and clean it up after the iteration is completed.

Is this a reasonable thing to do?

http://gitweb.freedesktop.org/?p=users-keithp-cairo;a=commitdiff;h=da2c5e44abd98f1f1aed4f716b7e9bc97a667058;hp=ade195cdba5b0d13c121e44709151bfbb0c44085

shows the changes needed.

-- 
keith.packard at intel.com
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