Minimising applications go to the wrong window list (with Compiz)

[Oli]

I have two screens in Twinview. On each screen there is a Gnome-Panel at the bottom, each with its own window-list applet. Simple enough. If I open a window and move it over the second screen, the window list (correctly) updates.

But if I then minimise the application, it and its window-list entry move over to the primary screen. Restoring the application from the primary window-list applet moves it back to the second screen.

Steps for reproduction:

 - Prereqs: gnome-panel, compiz, two screens in Twinview
 - Create a new panel on second screen
 - Add Window List applet to new panel
 - Open any new window and move over to second screen
 - Minimise the window (in any way)
 - Glory as the window-list entry moves over to the primary window-list-applet.

I should point out that this only seems to happen with Compiz. I admit I have very little understanding about how the window-list applet interfaces with the WM to get the lists of applications so this could very easily be a Compiz issue as much as it is a Gnome-Panel issue.

Feel free to call me an idiot for filing it in the wrong place.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gnome-panel 1:3.4.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-21.34-generic 3.2.13
Uname: Linux 3.2.0-21-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0-0ubuntu4
Architecture: amd64
Date: Wed Apr 4 14:14:05 2012
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
SourcePackage: gnome-panel
UpgradeStatus: Upgraded to precise on 2012-04-03 (0 days ago)

[Oli (oli)]

There's a lot of jargon around the window-applet/WMs so I've drawn a very simple explanation of what's going on.

[Oli (oli)]

I have found that enabling the "Keep previews of minimized windows"-workaround in CCSM fixes this.

I'm not sure if that should be turned on by default or if my configuration was just *that* non-standard. Either way, this is enough for me.

[peter mueller (grandmastermt2000)]

Hi Oli,

I have the exact same problem you experienced, using either Ubuntu 12.04 with gnome classic + effects or Xubuntu 12.04 using compiz instead of the xfwm.

As you can see, I also did a bug report on it (I must have missed yours): https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/985651

It's good to know, I am not the only one. I will later try your proposed workaround, because I could not come up with one.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[peter mueller (grandmastermt2000)]

I can confirm, that activating "Keep previews of minimized windows" in CCSM @ "Workarounds" fixes this.