Closes#28414
Makes it so that `do`, `then`, `done`, `else`, etc are treated as
brackets in bash. They are not auto-closed *yet* as that requires
additional work to function properly, however they can now be toggled
between using `%` in vim. Additionally, newlines are inserted like they
are with regular brackets (`{}()[]""''`) when hitting enter between
them.
While `if <-> fi` `while/for <-> done` and `case <-> esac` are the
*logical* matching pairs, I've opted to instead match between `then <->
else/elif/fi` `do <-> done` and `in <-> esac` as these are the pairs
that delimit the sub-scope, and are more similar to the `{}` style
bracket pairs than `if <-> }` in a c-like syntax. This does cause some
wierd behavior with `else` in `if` expressions as it matches both with
the previous `then` as well as the following `fi`, so in this case
```bash
if true; then
foo
else
bar
f|i
```
after hitting `%` twice times (where cursor is `|`), the cursor will end
up on the `then` instead of back on the `fi` as hitting `%` on the else
will *always* navigate up to the `then`
Release Notes:
- vim: Improved behavior around word-based delimiters in bash (`do <->
done`, `then <-> fi`, etc) so they can be toggled between using `%`
fc920bf63d