Unlike 4.4x, the right-click context menus for task list items and the right-click context menus for Xfwm window borders look completely dissimilar. Their layout and functionality differ, despite both being meant to serve the same purpose. Screenshot here: http://img135.imageshack.us/img135/3544/wmmenune1.png
Yes, we switched to libwnck in xfce 4.6. Still the window manager offers different options to manipulate the windows (it's its role) so I don't see any bug here.
Will be fixed in the near future, since I find this annoying too.
Well I have no plan to change xfwm4 menu to mimic libwnck, what is your plan then?
Created attachment 1928 PAtch to rework xfwm4 window menu This patch changes both the phrasing and the order of the xfwm4 menu entries. This will break all current translations, but if we want this in 4.6, we need to commit it ASAP before beta2. This makes the window menu a bit less "geeky" IMHO (which is a good thing, of course).
Created attachment 1929 Better phrasing
Anyway, committed in xfwm4.