Adds a "move to previous pane" and "move to next pane" keybinding, which
navigates to the last/first focused pane
We assign pane IDs on creation and maintain a vector of active pane IDs
in MRU order. Navigating panes by MRU then requires specifying which
pane ID we want to focus.
From our offline discussion (thanks @zadjii-msft for the concise
description):
> For the record, the full spec I'm imagining is:
>
> { command": { "action": "focus(Next|Prev)Pane", "order": "inOrder"|"mru", "useSwitcher": true|false } },
>
> and order defaults to mru, and useSwitcher will default to true, when
> there is a switcher. So
>
> { command": { "action": "focusNextPane" } },
> { command": { "action": "focusNextPane", "order": "mru" } },
>
> these are the same action. (but right now we don't support the order
> param)
>
> Then there'll be another PR for "focusPane(target=id)"
>
> Then a third PR for "focus(Next|Prev)Pane(order=inOrder)"
> for the record, I prefer this approach over the "one action to rule
> them all" version with both target and order/direction as params,
> because I don't like the confusion of what happens if there's both
> target and order/direction provided.
References #1000Closes#2871
04309a2a49