new task: rewrite basic cursor.sml functions (h, j, k, l) to look for 'is line break preceded by non-line break?' rather than 'is there a double line break?' because the second question which is already implemented has buggy behaviour on triple line breaks, where cursor does not go to the place user expects. Currently, on Cursor.viL has been rewritten to match the first question.

temp.txt

@@ -5,6 +5,8 @@ sig
              -> MailboxType.t list
 end
 
+
+
 structure TextBuilder :> TEXT_BUILDER =
 struct
   val xSpace = 13