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.

val x : transaction int = Monad.liftM2 plus (return 1) (return 2)

val x : transaction xbody = List.mapXiM (fn i x => return <xml><li>{[i]} = {[x]}</li></xml>) (1 :: 2 :: [])