Follow-up Comment #2, bug #19879 (project mypaint):
Ah, nice catch...
I have also noticed that the new RNG seems to be a lot slower. Calls to
rng_double_set_seed() and rng_int_set_seed() are showing up in the profile,
taking up a significant (around 50%) amount of time for small brushes.
Of course, set_seed() is usually not called as often as we do, however we also
don't need a very good RNG. We effectively destroy the state by calling
set_seed anyway, no point wasting much time calculating a good seed...
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