Ctrl-Left/Right Arrow doesn't work with vi key bindings

[YaLTeR]

fish version 3.0.2
Fedora 31 and Arch Linux, Tilix and Alacritty

Ctrl-Left/Right Arrow do something weird instead of working when the vi key bindings are active. Alt+Left/Right Arrow works fine.

1. sh -c 'env HOME=$(mktemp -d) fish'
2. fish_vi_key_bindings
3. Type something and try using Ctrl-Left/Right Arrow

[faho]

Please execute fish_key_reader, press ctrl-left. That'll give you something like

bind \e\[1\;5C 'do something'

Take that, chop off the "do something" bit, so that you just execute

bind \e\[1\;5C

On my system that just says it's bound to "forward-word" in the default bindings and nothing in the vi ones, which seems correct.

[YaLTeR]

That's the same as I get. So I guess it tries executing the sequence literally which leads to the "weird behavior" (exiting to normal mode and sometimes inserting additional text from previous command).

[faho]

Well, that's to be expected. Ctrl-arrow sends

\e\[1\;5C

which is escape, then [1;5C. So it does the thing for escape, which is exit to normal mode, then the thing for [, which is searching history, then the thing for ;, which is repeating a jump, then the thing for 5, which is nothing, then the thing for C, which is killing a line and repainting.

I don't think there is a good way around this, because we can't conclusively enumerate all possible escape sequences, and I don't think there is a set enough pattern for these.

[YaLTeR]

Maybe ctrl+arrows should be bound for the vi insert mode by default? In the actual vim insert mode ctrl+arrows also jumps words.

[faho]

Huh, so it does.

Yeah, lemme fix that.