A windowing bug on manimize/restore

[Takuma Murakami]

I notice a bug on the new windowing code, which resides in
release-45 or newer versions of Cygwin/X.  To reproduce:
1) Invoke XWin.exe in -multiwindow mode.
2) Open 2 windows (A and B) and make them overlapped.
3) Minimize window A.
4) Minimize window B.
5) Restore window B.
Then you will see that the contents of window A are drawn
in window B in the overlapped area.

I suspect the bug with MSVDM reported by Andrew Braverman
may be the same symptom.

As a workaround, you can get back the correct Z order by
restoring window A (in the above example).  I will work to fix
the problem as soon as possible.

Takuma Murakami