Code review comment for lp:~aacid/unity8/select_first_submenu_when_it_appears

It does improve the situation but there is something odd:

again, using kate as an example, opening the Tools menu, navigate down to a submenu, enter it, navigate down to the third entry, press left, go to another submenu, enter it. Now the highlight will be at the third entry instead of starting at the first again.

also I managed to get into the situation where I lost keyboard focus altogether in the menu by navigating through the main menu entries. While I'm not 100% sure that is introduced by this branch, I haven't seen it in trunk so far.