Match Vim9 comments at start-of-line (no leading whitespace) in
dictionaries, lists and parenthesised expressions and argument lists.
Addresses https://github.com/vim/vim/pull/14975#issuecomment-2832643115
Report and fix by Aliaksei Budavei.
closes: #17211
Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
