GDI leak fixed in multiwindow mode, thanks to Kensuke's work

[Kensuke Matsuzaki]

Earle,

> It seems that we've got a lot of cut-n-pasted code in XWin. :(
> If someone has a few spare hours they should see if we can add
> a common multiwindow utility function file for things like
> generating class names or reloading the g_hiconX.

I thought same thing when I tested off-by-one error and GDI leaks.
MWExtWM's windows cursor and sizing/moving window improvement may
be able to apply to multiwindow mode.

Kensuke Matsuzaki
-- 
Kensuke Matsuzaki
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