Up arrow at top of list should drop to bottom in list view

[bobpaul]

In browse view, when a user is at the top of the set of items, the up arrow causes selection to loop back around to the bottom. This makes it easier to reach items at the end of the alphabet. In list view, the up arrow does nothing once the top of the list is reached.

This is a consistency bug. One would expect the same behavior for the Up/Down? arrows in both view modes. 'Down' at the bottom of the list should jump to the top and 'up' at the top of the list should jump to the bottom.

I'm using 0.21.0+fixes18722-0ubuntu1

[stuartm]

UI has been completely re-written in trunk.