* When in a multi-line comment, we would have liked to use the start of
the comment as a reference point for the indentation inside the comment,
but determining the number of columns shifted for the comment start
woudl require determining the length w/r/t graphemes, which we do not
currently implement. We would like to avoid taking on a runtime
dependency on a grapheme-parsing library.
Instead, we look at the indentation level on the previoud line or start
of the comment as a reference point, and correct shift for lines
starting with an asterisk.