Bug#643656: Acknowledgement ([plasma-desktop] KDE: applications vanishing from taskbar and icons not showing up in tray)

[Török Edwin <edwintorok@gmail.com>]

OK, here's a way to make it vanish:
1. click icedove taskbar icon once to focus it
2. click it again
3. click it a 3rd time
4. Notice that icon vanished.
5. Confirm that it is still running (ps -ef|grep icedove)
edwin     5534  4139  3 10:21 ?        00:08:42 /usr/lib/icedove/icedove-bin --sm-config-prefix /icedove-bin-YjY0oX/ --sm-client-id 10c5d36269000130345779200000045160010 --screen 0
6. Notice that it vanished from the Alt-Tab list too
7. Run icedove again, then it'll focus the window and make the taskbar icon appear again, and appear in the alt-tab list too
8. Confirm that its still the same icedove with 'ps', check that its same PID:
edwin     5534  4139  3 10:21 ?        00:08:52 /usr/lib/icedove/icedove-bin --sm-config-prefix /icedove-bin-YjY0oX/ --sm-client-id 10c5d36269000130345779200000045160010 --screen 0

Hopefully this is enough information to help you reproduce this bug.

Best regards,
--Edwin