Add ability to match in next and previous char pairs

[thomasschafer]

Adds the ability to match inside/around the next or previous matching character pair: for instance, with the cursor as █ below:

█ let x = "bar";

typing ]" would select the contents of the string (i.e. bar).

Screen.Recording.2024-07-21.at.22.30.56.mov

This is a modified version of this PR, based on the discussion there.

Partially resolves:

• Automatically jump to matching brackets #1974
• "Match next pair" with `[`/`]` followed by `m` (or: a better `vi"` from VIM) #9895
• Modify matching behavior when it fails to find the matching character #10567

[thomasschafer]

I've realised that I haven't taken into account this comment about using a fallback command rather than an on-next-key callback - I'm happy to rewrite this PR using that idea instead if desired

[pascalkuthe]

yeah I wouldn't want to change the default keymap like this. I think Mikes idea about adding a generic notion of a fallback command is a good idea. Could be particularly useful for plugins/user keymaps in the future.

[the-mikedavis]

For this PR I was imagining we could start with adding a goto next "any pair" command since that wouldn't need changes to the keymap code or an on-next-key. I'll try to clean up my fallback command changes and submit a PR for that so we can add the versions where you jump to a specified pair too

[thomasschafer]

For this PR I was imagining we could start with adding a goto next "any pair" command since that wouldn't need changes to the keymap code or an on-next-key. I'll try to clean up my fallback command changes and submit a PR for that so we can add the versions where you jump to a specified pair too

Sounds good - I'll update my PR when that's in. Thank you both!

[thomasschafer]

Closing in favour of #11695