Kate doesn't stay on Unity launcher

Bug Description

Although I like Gedit, my favourite text editor is Kate. I installed it in Natty, but a funny thing happens: I try to keep it in the launcher, and for the session it stays; when I log out and log in again, it's not there anymore.

I don't whether this happens with KDE apps, Qt apps or Kate in particular. I have Clementine sitting there, and it doesn't go anywhere, so Qt is not likely to be the problem.

The version of Kate installed is 4:4.6.1-0ubuntu1

I figured apport wouldn't give me anything useful here, but if you need anything else, let me know...

I can confirm this with the LaTeX editor Kile. Probably the handling of .desktop files in '/usr/share/applications/kde4' is the problem, as the launcher item is added to the favorites just as 'kile.desktop'. Also, pinning and unpinning a KDE app will cause unity to crash (had not yet time to gather a backtrace, but it's likely the same as in bug 688803.

likely the same issue that bug #741129

closing it's not an unity bug and a duplicate