The problem seems to be that the popup menu is displayed on button-down,
not button-up like on Windows. ...
Or has something already been done to fix this
I have opened Bug #238733 exactly about this.
Not only does Sebastien
Bacher forbid to discuss this matter in Launchpad (as a bug), but
he also decided to mark my text with Invalid status so that no
launchpad browser could find it in the Wishlist.