Fix XML indentation in Emacs mode The return value of MATCH-STRING is a string. At least on Emacs 25, the comparisons between string and character with EQUAL could never succeed, and so the cases for matching braces were never triggered. GET-TEXT-PROPERTY may return a list rather than an atom (for example, on long lines with whitespace-mode turned on), and this broke the heuristic of looking for the tag face in previous text.

fun main () : transaction page =
  (a, b) <- return (1, 2);
  {C = c, ...} <- return {C = "hi", D = False};
  d <- return 2.34;
  {1 = e, 2 = f} <- return (8, 9);
  return <xml>{[a]}, {[b]}, {[c]}, {[d]}, {[e]}, {[f]}</xml>