Re: XServer draws to incorrect window when using VirtuaWin

[Jon TURNEY <jon dot turney at dronecode dot org dot uk>]

On 03/09/2010 10:01, Pete wrote:
> On 13 August 2010 11:38, Pete<sneakypete81@gmail.com>  wrote:
> > VirtuaWin (http://virtuawin.sourceforge.net/) is a virtual desktop
> > manager for Windows that lets you switch between several "virtual
> > desktops", similar to those provided in KDE&  Gnome.
> >
> > When switching between desktops that have CygwinX windows open,
> > occasionally the Xserver draws to the wrong window. This is difficult
> > to describe, so will continue with an example:

I'm afraid I think this falls into the category of "known problems", see [1].

The tricks that XWin uses to implement multiwindow mode don't seem to be 
compatible with the tricks that VirtuaWin uses to implement multiple desktops.

[1] https://bugs.freedesktop.org/show_bug.cgi?id=21540

> > Using Windows 7, Cygwin/X v1.8.0
> >
> > Steps to reproduce:
> > 1) Install VirtuaWin from http://virtuawin.sourceforge.net/
> > 2) Start the CygwinX server
> > 3) Open a (DOS) cygwin window
> > 4) Type "xterm&" twice, to open two xterm windows. Maximise these two
> > windows to full screen.
> > 5) Move one of these windows to desktop2
> > 6) Type "ping google.com -n 1000" to get a stream of data appearing in
> > the xterm window on desktop2
> > 7) Go back to desktop1, and make sure the DOS cygwin window is selected
> > 8) Switch back to desktop2. The "ping" xterm window should be selected.
> > 9) Switch back to desktop1. The cygwin window should be selected.
> >
> > What should happen:
> > The empty xterm session on desktop1 should be displayed in the window
> > behind the cygwin window
> >
> > What happens:
> > The ping data stream appears in the xterm window on desktop1, and
> > continues receiving updates every second.
> > Selecting the xterm window causes the ping data to disappear and the
> > empty xterm session to be displayed correctly.
> >
> > This is reproducible every time. The critical thing is that if the
> > xterm window on desktop1 is not selected after a desktop switch, it
> > shows the data from the xterm window on desktop 2.
> >
> > FWIW, this problem doesn't exist with xming, and I haven't seen the
> > issue with any other applications.

Xming version number, please?

> Is there anything else I can do to help debug this? Unfortunately it
> is necessary to install VirtuaWin to reproduce the issue, but it's
> very reproducible.

--
Jon TURNEY
Volunteer Cygwin/X X Server maintainer

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