ace 修改

Cannot disable showInvisibles when init Ace

https://github.com/ajaxorg/ace/issues/2402

return self.showInvisibles
                    ? "<span class='ace_invisible ace_invisible_space ace_invalid'>" + self.SPACE_CHAR + "</span>" :
                    lang.stringRepeat("\u00a0", c.length);
                    
                    
2. copy时
s = s.replace(/\xA0/g, " ");