Wrong or missing icons for libreoffice in cinnamon taskbar

[xtrailrunner]

I'm using Ubuntu 12.10 with cinnamon 1.6.7 and libreoffice 3.6.4.3.
When launching a program of the suite in some reproducible cases no icon or the wrong icon is displayed in the taskbar.
Examples:
Running a .doc document with writer the icon of impress is displayed.
Running a .xls document with calc the icon of writer is displayed.
Sometimes there is also no icon at all.

Any help is appreciated because this is really confusing.

[xtrailrunner]

Interesting observation:
If I move the running LO application to another workspace the icon will be corrected. If I move the LO application back to the original workspace the icon stays correct.
That's a nice workaround

[xtrailrunner]

Seems to be related with this:
https://github.com/linuxmint/Cinnamo...1fccab73e1a079
Copied windowList.js to /usr/share/cinnamon/js/ui but without effect.