diff --git a/lib/ace/mouse/mouse_handler.js b/lib/ace/mouse/mouse_handler.js
index 41521120..e3b45abf 100644
--- a/lib/ace/mouse/mouse_handler.js
+++ b/lib/ace/mouse/mouse_handler.js
@@ -40,6 +40,7 @@ var DragdropHandler = require("./dragdrop_handler").DragdropHandler;
 var config = require("../config");
 
 var MouseHandler = function(editor) {
+    var _self = this;
     this.editor = editor;
 
     new DefaultHandlers(this);
@@ -76,12 +77,15 @@ var MouseHandler = function(editor) {
     });
 
     editor.on('mousemove', function(e){
-        var char = editor.renderer.pixelToScreenCoordinates(e.x, e.y);
+        if (_self.state)
+            return;
+        
+        var char = editor.renderer.screenToTextCoordinates(e.x, e.y);
         var range = editor.session.selection.getRange();
 
-        if( !range.isEmpty() && range.contains(char.row, char.column) ){
+        if (!range.isEmpty() && range.inside(char.row, char.column)) {
             editor.setStyle("ace_selection");
-        }else{
+        } else {
             editor.unsetStyle("ace_selection");
         }
     });