Kitty: Add last_tab and last_window hotkeys

[marningmol]

I want to try kitty as a replacement for tmux, but an integral part of my workflow depends on the use of the following Tmux commands which I cannot find a replacement for in Kitty:

last-pane [-de] [-t target-window]
                   (alias: lastp)
             Select the last (previously selected) pane.  -e enables or -d
             disables input to the pane.

last-window [-t target-session]
                   (alias: last)
             Select the last (previously selected) window.  If no
             target-session is specified, select the last window of the cur‐
             rent session.

Just to make it blindingly obvious, the behavior here is for a hotkey that switches to whatever Window / Tab is not currently active but was most recently active.

I believe this would be easy to add and make a good improvement to Kitty.

[kovidgoyal]

sure, should not be hard. I'll get to it when I have a moment, feel free to submit a patch before then, if you want.

[marningmol]

Sadly I don't have the time to get into this codebase. I'll wait patiently and be much obliged when it lands.

[pablox-cl]

@kovidgoyal, can you point to me where this functionality could be, so I can take a look?

[kovidgoyal]

Run kitty from master or wait for the next release and then use goto_tab
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