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Preserve blank lines before a closing fmt: on comment (#5300)

* Preserve blank lines before a closing fmt: on comment

The blank run that terminates a fmt: off region lives in the prefix of the
following '# fmt: on' standalone comment, not in the verbatim block that
_handle_regular_fmt_block produces. _maybe_empty_lines therefore capped it
to max_allowed like any ordinary blank run, silently reformatting lines the
user had opted out of.

Skip the cap for a '# fmt: on' comment that closes a converted block.

* Add CHANGES.md entry

* Apply suggestion from @cobaltt7

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Co-authored-by: cobalt <61329810+cobaltt7@users.noreply.github.com>

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