Handle autoclose when composing text (#7611)

This fixes two annoyances when composing text and autoclose is enabled.

Example: use a Brazilian keyboard and type `"`, which triggers a
dead-key state.

Previously when a user would type `"<space>` to get a quote, we'd end up
with 4 quotes.

When text was selected and a user then typed `"<space>` the selected
text would be deleted.

This commit fixes both of these issues.

Fixes https://github.com/zed-industries/zed/issues/4298

Release Notes:

- Fixed autoclose behavior not working when composing text via IME (e.g.
using quotes on a Brazilian keyboard)
([#4298](https://github.com/zed-industries/zed/issues/4298)).

Co-authored-by: Antonio <antonio@zed.dev>
Co-authored-by: bennetbo <bennetbo@gmx.de>