use setCursorStyle instead of modifying classes

lib/ace/css/editor.css

@@ -50,10 +50,6 @@
     cursor: text !important;
 }
 
-.ace_selection .ace_content {
-    cursor: default;
-}
-
 .ace_gutter {
     position: absolute;
     overflow : hidden;

lib/ace/mouse/mouse_handler.js

@@ -82,11 +82,12 @@ var MouseHandler = function(editor) {
         
         var char = editor.renderer.screenToTextCoordinates(e.x, e.y);
         var range = editor.session.selection.getRange();
-
+		var renderer = editor.renderer;
+		
         if (!range.isEmpty() && range.insideStart(char.row, char.column)) {
-            editor.setStyle("ace_selection");
+            renderer.setCursorStyle("default");
         } else {
-            editor.unsetStyle("ace_selection");
+            renderer.setCursorStyle("");
         }
     });
 };