Comment 1 for bug 700739

I can see how this would be problematic for some users. When the user clicks on a menu and moves the cursor to an adjacent menu, focus will automatically switch to the new menu. However, by that reasoning, the user would expect the menu to close completely if they move the cursor away from it completely, which it doesn't.

This isn't a trivial fix given that this functionality is deeply rooted within the Ubuntu GUI. I'm not sure if this is a GTK things, or something to do with Gnome's implementation of it, but this will require some work to change, so I am marking this as invalid for the paper cuts project.