TreeView notifications fix (take 2)

[Mike Hearn]

> OK I tested this, and I see no evidence that IsWindowUnicode takes
> into account the dlgproc under Windows. So I'm afraid the patch is
> wrong.

Hmmm. Perhaps then IsWindowUnicode doesn't work in Windows by checking
the window proc at all? MSDN doesn't mention such a thing.

Possibly the character set of the window is stored as an extra field in
the WND struct, and set manually by the window/dialog creation
functions. Would that be an acceptable way to implement this?

-- 
Mike Hearn <m.hearn at signal.qinetiq.com>
QinetiQ - Malvern Technology Center