fix #1840 The last CJK character of a wrapped line drops down

lib/ace/edit_session.js

@@ -1958,6 +1958,8 @@ var EditSession = function(text, mode) {
             split = lastSplit + wrapLimit;
             // The split is inside of a CHAR or CHAR_EXT token and no space
             // around -> force a split.
+            if (tokens[split] == CHAR_EXT)
+                split--;
             addSplit(split);
         }
         return splits;