Comment 6 for bug 1192688

I have noticed when using Matlab, a Java-based GUI. I can reproduce it reliably:

Start Matlab, select Help -> Product Help, then back in the main window, File -> New -> Class. Then close the Editor while watching the Panel. Both the Editor and main MATLAB window buttons will disappear, even though Matlab is still running.

I think this is the same issue with Java-based GUIs that affected the gnome panel, see: https://bugs.launchpad.net/ubuntu/+source/libwnck/+bug/144406 and http://cgit.compiz.org/compiz/plugins/workarounds/commit/?h=compiz-0.8&id=79f11ed2cd71d2155a5e04aa8803c56633b212bb. From that page:

"Certain java applications set themselves to be transient when they open a modal dialog, causing them to disappear from the taskbar window list. This workaround notices when the transient property is unset and adds the window back to the taskbar."

I've taken a peek at the source for the tasklist but I'm not sure how to work this in.