fix a formatting bug with comments and multiline strings

src/format.rs

@@ -844,13 +844,19 @@ impl<'a> Formatter<'a> {
  if lines.is_empty() {
  return;
  }
- let last_word_comment = lines
+ let prevent_compact = lines
+ .iter()
+ .flatten()
+ .filter(|word| !matches!(word.value, Word::Spaces))
  .last()
- .unwrap()
- .last()
- .is_some_and(|word| matches!(word.value, Word::Comment(_)));
+ .is_some_and(|word| {
+ matches!(
+ word.value,
+ Word::Comment(_) | Word::OutputComment { .. } | Word::MultilineString(_)
+ )
+ });
  if lines.len() == 1
- && !last_word_comment
+ && !prevent_compact
  && !lines[0].iter().any(|word| word_is_multiline(&word.value))
  {
  self.format_words(&lines[0], true, depth);
@@ -863,7 +869,7 @@ impl<'a> Formatter<'a> {
  curr_line.chars().count()
  };
  let compact = allow_compact
- && !last_word_comment
+ && !prevent_compact
  && match self.config.compact_multiline_mode {
  CompactMultilineMode::Always => true,
  CompactMultilineMode::Never => false,
@@ -890,6 +896,9 @@ impl<'a> Formatter<'a> {
  self.format_words(line, true, depth);
  }
  if !compact {
+ if prevent_compact {
+ self.output.push('\n');
+ }
  for _ in 0..self.config.multiline_indent * depth.saturating_sub(1) {
  self.output.push(' ');
  }