Make mi<char> consistent

[leath-dub]

Maybe I am missing something here, but it seems like the mi<char> action is inconsistent. If we compare quote delimited block "<stuff ...>" with a brace delimited block (<stuff ...>).

If I have my cursor on the first quote and put in the keys mi" it does not select anything else. In contrast if my cursor is on the first bracket and put in the keys mi( it selects everything inside of the brackets.

I definitely prefer the latter behaviour, it is how vim behaves too, and is useful as it allows you to go f"mi" for example, rather than f"lmi".

[nik-rev]

this is worked on in #12494