We don't need it there so no need to enable it.
I'm leaving the disabled reason checks there, even though they're now redundant,
because they're only one-liners and they communicate intent.
The only time we should call SetSelectedLineIdx is when we are happy for a
select range to be retained which means things like moving the selected line
index to top top/bottom or up/down a page as the user navigates.
But in every other case we should now call SetSelection because that will
set the selected index and cancel the range which is almost always what we
want.
This adds range select ability in two ways:
1) Sticky: like what we already have with the staging view i.e. press v then use arrow keys
2) Non-sticky: where you just use shift+up/down to expand the range
The state machine works like this:
(no range, press 'v') -> sticky range
(no range, press arrow) -> no range
(no range, press shift+arrow) -> nonsticky range
(sticky range, press 'v') -> no range
(sticky range, press arrow) -> sticky range
(sticky range, press shift+arrow) -> nonsticky range
(nonsticky range, press 'v') -> no range
(nonsticky range, press arrow) -> no range
(nonsticky range, press shift+arrow) -> nonsticky range
We have not been good at consistent casing so far. Now we use 'Sentence case' everywhere. EVERYWHERE.
Also Removing 'Lc' prefix from i18n field names: the 'Lc' stood for lowercase but now that everything
is in 'Sentence case' there's no need for the distinction.
I've got a couple lower case things I've kept: namely, things that show up in parentheses.
I don't see a reason why this restriction to have the selection be always
visible was necessary. Removing it has two benefits:
1. Scrolling a list view doesn't change the selection. A common scenario: you
look at one of the commits of your current branch; you want to see the how
many'th commit this is, but the beginning of the branch is scrolled off the
bottom of the commits panel. You scroll down to find the beginning of your
branch, but this changes the selection and shows a different commit now - not
what you want.
2. It is possible to scroll a panel that is not the current one without changing
the focus to it. That's how windows in other GUIs usually behave.
