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fix: don't end HTML comment blocks on a blank line (#1155)

HTML blocks of types 1-5 (e.g. `<!--` comments) must continue until
their closing sequence (`-->` for comments), per CommonMark. Only
types 6 and 7 end on a blank line.

The block scanner broke out of the continuation loop whenever a line
was outdented below the current block indent. Inside a container such
as a list item, a blank line is outdented (its sCount is 0), so a
comment block was terminated early instead of running to `-->`.

Skip that break for outdented blank lines unless the block type
actually ends on a blank line, so comment blocks no longer depend on
indentation. Adds regression fixtures for issue #1144.

Co-authored-by: ATOM00blue <219721791+ATOM00blue@users.noreply.github.com>

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