[PyQt] QUndoCommand.undo() not getting called upon push()

[Adeodato Simó]

Hello,

I define a couple QUndoCommand classes based on a mixin, where the undo
command of one is the redo of the other, and vice-versa. See the attached
file.

Unfortunately this has stopped working with PyQt 4.6. Executing the
attached file prints "inserting foo", "removing bar" with PyQt <= 4.5,
but does nothing with 4.6.

Is this breakage expected? Is my usage not supported? Many thanks in
advance.

-- 
- Are you sure we're good?
- Always.
        -- Rory and Lorelai
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