system tray widget shows application which is not running

[Wesley Schwengle]

Binary package hint: kdebase

Sometimes the system tray widget doesn't work as expected. It will display an
icon of a window which does not exist. See vid at
http://opperschaap.net/~wesleys/incorrect_taskbar.mpeg

You'll see two firefox windows, one with www.dumpert.nl which does not exist,
and one with google.

I've seen this behavior also on Debian testing/unstable.

Ubuntu packages:
kdebase-plasma:
  Installed: 4:4.3.3-0ubuntu3
  Candidate: 4:4.3.3-0ubuntu3
  Version table:
 *** 4:4.3.3-0ubuntu3 0
        990 http://archive.ubuntu.com lucid/main Packages
        100 /var/lib/dpkg/status
     4:4.3.3-0ubuntu1~ppa1 0
        500 http://ppa.launchpad.net karmic/main Packages
     4:4.3.2-0ubuntu3 0
        500 http://archive.ubuntu.com karmic/main Packages
plasma-widgets-workspace:
  Installed: 4:4.3.3-0ubuntu3
  Candidate: 4:4.3.3-0ubuntu3
  Version table:
 *** 4:4.3.3-0ubuntu3 0
        990 http://archive.ubuntu.com lucid/main Packages
        100 /var/lib/dpkg/status
     4:4.3.3-0ubuntu1~ppa1 0
        500 http://ppa.launchpad.net karmic/main Packages
     4:4.3.2-0ubuntu7.1 0
        990 http://archive.ubuntu.com karmic-updates/main Packages
     4:4.3.2-0ubuntu7 0
        500 http://archive.ubuntu.com karmic/main Packages
plasma-widgets-addons:
  Installed: 4:4.3.3-0ubuntu1
  Candidate: 4:4.3.3-0ubuntu1
  Version table:
 *** 4:4.3.3-0ubuntu1 0
        990 http://archive.ubuntu.com lucid/main Packages
        100 /var/lib/dpkg/status
     4:4.3.3-0ubuntu1~ppa2 0
        500 http://ppa.launchpad.net karmic/main Packages
     4:4.3.2-0ubuntu5.1 0
        990 http://archive.ubuntu.com karmic-updates/main Packages
        990 http://archive.ubuntu.com karmic-proposed/main Packages
     4:4.3.2-0ubuntu5 0
        500 http://archive.ubuntu.com karmic/main Packages

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu lucid (development branch)
Release: 10.04
Codename: lucid

uname -a
Linux eniac 2.6.32-5-generic #6-Ubuntu SMP Mon Nov 23 11:49:07 UTC 2009 i686
GNU/Linux