Latest xfce4-panel SVN crash when I try to remove instances of the showdesktop
plugin. It show the confirmation dialog and I press the remove button, and then;
crash. When xfce4-panel starts again, the item isn't removed.

I have tried in a new panel as well as in an exsisting panel. Same result.

Reproducible: Always
Steps to Reproduce:
1. Right click on an instance of the showdesktop plugin, and select "Remove".
2. Confirm the action in the confirmation dialog.
Actual Results:  
xfce4-panel crashes.

Expected Results:  
the showdesktop plugin should be removed, and the panel shouldn't crash.