(Originally Ubuntu bug 606904
I've tested this on 4.6.2 ubuntu packages and the 4.6.x git repo as of today (top commit is 2459e1153c38e32520e012456fd010712fb873db )
1) Hit alt-space to bring up the window menu
2) Move the mouse down to highlight the 'move to another workspace >' option
3) Hit right arrow to highlight one of the workspaces
4) Hit escape - the menu disappears
For me this hangs xfwm4 completely, none of the ctrl-alt-arrows change workspace, I can't move windows, and I might be left
without any focus anywhere.
Note, this is in a gnome session where I did xfwm4 --replace &
(I can trigger this more easily using the accelerators in my patch in bug 5649 but I checked that I can still trigger this using an unpatched xfwm4)
Fixed in master and xfce-4.6 branches, thanksfor reporting this!