fix ace not getting focus on mousedown when iframe is focused

node_modules/ace/lib/ace/mouse/mouse_handler.js

@@ -53,6 +53,8 @@ var MouseHandler = function(editor) {
         if (!document.hasFocus || !document.hasFocus())
             window.focus();
         editor.focus();
+        if (!editor.isFocused())
+            window.focus();
     };
 
     var mouseTarget = editor.renderer.getMouseEventTarget();