message: Fix another corner case in `a"`
  Messed this up in
  Refs
diff: @@ -1976,7 +1976,7 @@ export abstract class MoveQuoteMatch extends BaseMovement {
  end += trailingWhitespace;
  } else {
  // ...otherwise include leading whitespace
  - start = text.substring(0, start).search(/\S\s+$/) + 1;
  + start = text.substring(0, start).search(/\s*$/);
  }
  }
  