Implement LockWindowUpdate [take 3]

[Alexandre Julliard]

Mike Hearn <mike at theoretic.com> writes:

> That went over my head I'm afraid. What do you mean by concerned?

A DC would be concerned if it could have its visible region changed by
the fact that the lock window is set, so this would be basically any
DC used by the old and new lock windows and all their visible children.

> Could you have told me this when I first submitted my patch? I feel it's
> been a bit of a waste of time now - looking at the code it seems that
> inter-process invalidation is not trivial thing.

Pretty much nothing in the painting code is trivial I'm afraid...

-- 
Alexandre Julliard
julliard at winehq.com