Multiline string enhance (#4168)

optimise the call to wasTripleQuoted, so that it would only get called once
remove escaping of " for multilines

metals/src/main/scala/scala/meta/internal/metals/formatting/MultilineString.scala

@@ -93,28 +93,19 @@ case class MultilineString(userConfig: () => UserConfiguration)
  line: String,
  ): Option[(Int, Boolean)] = {
  var lastTripleQuote = -1
- var escaped = false
  var tripleQuoteClosed = closedFromPreviousLines
  var quoteNum = 0
  for (i <- 0 until line.size) {
  val char = line(i)
  if (char == '"') {
- if (!escaped) {
- quoteNum = quoteNum + 1
- if (quoteNum == 3) {
- lastTripleQuote = i
- tripleQuoteClosed = !tripleQuoteClosed
- quoteNum = 0
- }
- } else {
- escaped = !escaped
+ quoteNum = quoteNum + 1
+ if (quoteNum == 3) {
+ lastTripleQuote = i
+ tripleQuoteClosed = !tripleQuoteClosed
+ quoteNum = 0
  }
- } else if (char == '\\') {
- quoteNum = 0
- escaped = !escaped
  } else {
  quoteNum = 0
- escaped = false
  }
  }
  if (lastTripleQuote != -1) Some((lastTripleQuote, tripleQuoteClosed))
@@ -441,18 +432,15 @@ case class MultilineString(userConfig: () => UserConfiguration)
  .find(_.nonEmpty)
  case (None, "\"") if onlyFourQuotes(splitLines, position) =>
  Some(replaceWithSixQuotes(position))
- case (None, "\n")
- if doubleQuoteNotClosed(splitLines, position) && !wasTripleQuoted(
- splitLines,
- position,
- ) =>
- Some(fixStringNewline(position, splitLines))
  case (None, "\n")
  if wasTripleQuoted(
  splitLines,
  position,
  ) =>
  Some(addTripleQuote(position))
+ case (None, "\n") if doubleQuoteNotClosed(splitLines, position) =>
+ Some(fixStringNewline(position, splitLines))
+
  case _ => None
  }
  }