I couldn't find similar problem here, so I'm creating a new post.

I faced this problem first time (I'm using KDE 4.7.2 on Arch Linux): I have 4 virtual dektops and Task Manager configured to show only tasks from current desktop. When I open a window on another dektop and close it, Task Manager creates a "placeholder" on all other desktops:


I have also Compiz enabled, but it the same with KWin.

The same problem was already mentioned here:
https://bbs.archlinux.org/viewtopic.php ... 5#p1008325
and here:
http://ubuntuforums.org/showthread.php?p=11360884

Does anyone know if there's a workaround for this and if a bug should be submitted? Or may be there's already a bug for this?

I haven't seen such a problem in KDE 4.6.

By the way, the more windows I open and close, the more placeholders appear. Finally the window buttons in task manager become very small and it turns to be very inconvenient to work.

For a good example, one may follow the first link and click on the image posted there (I can't copy it here because of size limitations)

Not completely sure it's the same problem, but a workaround for the "ghost entries" in the task manager has been submitted: https://git.reviewboard.kde.org/r/102779/

Hans,

Thanks for pointing this. Don't know, may be it's the same issue.

As I can see it's a review request, so the workaround is not in the mainline yet? Or I'm misunderstanding?

This review has been submitted with commit 681e1ef4b5f0f7e66d3333fa080badaaf9a7bac7 by Alex Fiestas to branch KDE/4.7.

So as far as I know, it should be available in 4.7.3.

Thanks! Let's wait for the new version, hopefully it will fix the problem

Indeed, after upgrade to version 4.7.3 the bug disappeared