Thanks for that branch -- it looks like a good fix to bug 620506. :-)

However, it's not really related to this bug, because this bug includes
scrolling to things that *aren't* focusable. For example, the "Total
size", "Version", "License", and "Updates" lines aren't focusable, and
should not be focusable. But you should still be able to scroll the pane
with the keyboard to read them.

This might be my fault, I guess, because for version 1 I asked that the
arrow keys work for focusing the departments in the lobby screen (which
rarely scrolled anyway), and you were copying that behavior with the GTK
version. But it doesn't work so well in the software item screen, and it
won't work so well if we add unfocusable elements to the bottom of the
lobby screen in future versions. It also has an unpleasant side effect
on both screens: if you're on a leftmost item and press Left, you end up
in the navigation pane, where pressing neither Left nor Right will get
you out again (it collapses or expands the selected branch instead).

So, one option is for us to retire the arrow-key focusing, leaving that
job to Tab and Shift Tab, and instead use arrow keys solely for
scrolling.

A more complex option is to behave a bit like the Elinks browser, where
the arrow keys change focus if there's anything focusable within range
in that direction, and if there isn't they just scroll.

-- 
Can't scroll lobby, department, or software item screens with the keyboard
https://bugs.launchpad.net/bugs/635994
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