implement persistent tab history The session file is now overloaded with the history info, that means that upon startup telescope can repopulate each tab history! The price to pay is that one can't start an old telescope with a new session file, otherwise will get a lot of fancy '<' and '>' tabs...

rework handle_imsg_session into a switch on the imsg type

simplify the lazy tabs handling it's cleaner to just toggle the lazy bit in switch_to_tab instead of pushing that complexity in load_url. While there also try to simplify the function and its documentation from unnecessary checks and extra verbosity. This also fixes a bug where Telescope ended up pushing the url on the history *twice* at startup.

bump default fill-column to 120

rephrase CAVEATS as per Florian suggestion, thanks!

rename set-title to change-title "set set-title = 1" is quite a mouthful. The old name will still be supported for a while to ease backwards compatibility.

yornp before quitting

de-quirkify execute-extended-command On RET, execute the command on the selected line rather than what the user typed. This saves a TAB (to expand the entry) and is more in line with the other completion commands.

bind del (aka backspace) to previous page Suggested by Florian, thanks!

add --corours as an alias for --color Suggested by Florian, thanks!

sync changelog

fix crash when --color is specified found and reported by Florian, thanks!

reuse struct session_tab when saving the session

move parse_last_session to the fs process ~/.telescope/session was parsed in the main process before dropping in the sandbox: that's no good. This moves the initialization of the ui events later in ui_main_loop and makes so that the fs process, after entering the sandbox, parses and sends the content of the last session back to the main process; when it's done the ui gets loaded and telescope is back rocking. I'm plannig to re-use the struct session_tab during the save session operation soon.

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