E.g. if/guard condition patterns are column-aligned, but hitting enter after
the ',' below wasn't column-aligning the next empty line:
guard let x = Optional(42),
// No indentation added here after enter
Also the isTargetContext() check takes a start and end token location, but
wasn't accounting for the end location pointing a multiline string, so we
weren't walking into such nodes. This meant we didn't realise the target
location was within a multiline string in some cases, and we ended up
interfering with whitespace in its content.
