Ticket #3288: 3288.patch

_source/plugins/wysiwygarea/plugin.js

@@ -38 +38 @@
                                         this.getSelection().lock();
                         }
                         else
-                                $doc.execCommand( 'inserthtml', false, data );
+                                this.document.$.execCommand( 'inserthtml', false, data );
                 }
         }