Seems to work in Xubuntu 15.04 (had the problem in 14.10 and it's fine after I upgraded). Please change it back to 'Confirmed' if you can reproduce the bug in 15.04 or nominate it to be logged as Confirmed in the 'Trusty' series if it's still not fixed there. I imagine it was probably a fix in Xfce 4.12 so probably not fixed in 14.04 still.
Seems to work in Xubuntu 15.04 (had the problem in 14.10 and it's fine after I upgraded). Please change it back to 'Confirmed' if you can reproduce the bug in 15.04 or nominate it to be logged as Confirmed in the 'Trusty' series if it's still not fixed there. I imagine it was probably a fix in Xfce 4.12 so probably not fixed in 14.04 still.