Autoformatter should handle reversed typing of delimiters

[maxbarnas]

📝 Provide a description of the improvement

The autoformat feature works when a user types opening and then closing delimiter. We would like to improve it to handle cases where the user types the closing delimiter, then moves the cursor back, to the beginning of the block that needs to be formatted.

1. foo *^bar**
2. Type *.
3. foo bar

There are helpful insights in #2388, specifically in #2388 (comment)

Insights from #2388:

• Make sure that the undone autoformatting does not get formatted again when typing.

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