[Bug 49366] mixins should have required base class

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=49366

--- Comment #1 from Jonny Lamb <jonny.lamb at collabora.co.uk> 2012-05-02 02:34:16 PDT ---
I guess this isn't a problem. I would argue that most of the time you don't
need convenience methods from base classes but we should encourage the use of
our base classes.

Fine by me.

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