Re: XServer draws to incorrect window when using VirtuaWin

[Jon TURNEY <jon.turney@dronecode.org.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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