Closes#31138
Fix edge case where adding newline if there is text afterwards end
delimiter of multiline comment, would continue the comment prefix. This
is fixed by checking for end delimiter on whole line instead of just
assuming it would always be at end.
- [x] Tests
Release Notes:
- Fixed the issue where in some cases the block comment continues to the
next line even though the comment block is already closed.
dd4e8b9e66