Bug#836246: libgtk-3-0: Upgrade from 3.20.9 to 3.21.5 broke Mate desktop

[D. B.]

Why did you log this against 3.20.9 if that one is fine?

Anyway, this is precisely what happens when you run unstable, the key is in
the name... It's not a problem; it's a logical consequence of using
unstable. Maybe you should be using testing if you care about breakage,
since unstable specifically advertises itself as being prone to breakage.

You just need to wait for MATE to update their stuff to match GTK+ and
unstable to receive those updates.
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