Z 1618/extend comments (#2585)

Fixes Z-1618. In the current state, this only works for line comments
such as `//` (and whatever's set in `{language}.toml` as a
line_comment).

Release Notes:

- Comments are now extended on new line.
e94129446dPiotr Osiewicz committed on 6/7/2023, 3:37:02 PM· committed by GitHubparentd5441ba
2 files changedLine totals unavailable