See the thread "Popups popping through windows using built-in rootless WM"
which can be found in the archive starting at
<http://cygwin.com/ml/cygwin-xfree/2005-05/msg00169.html>.
I suspect that this problem will require fairly deep understanding of how
Cygwin/X works, plus a fair bit of time to investigate it. According to the
<http://x.cygwin.com/> Cygwin/X web site we still do not have a maintainer
so I don't expect to see progress on this bug soon.
--
Owen Rees
Hewlett Packard Laboratories, Bristol, UK
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