Ticket #7561: 7561.patch

_source/plugins/selection/plugin.js

@@ -567 +567 @@
                         cache : {}
                 };
 
-                /**
-                 * IE BUG: The selection's document may be a different document than the
-                 * editor document. Return null if that is the case.
-                 */
+                // IE selection relies on editing host focus.
                 if ( CKEDITOR.env.ie )
                 {
                         var range = this.getNative().createRange();
@@ -578 +575 @@
                                 || ( range.item && range.item(0).ownerDocument != this.document.$ )
                                 || ( range.parentElement && range.parentElement().ownerDocument != this.document.$ ) )
                         {
-                                this.isInvalid = true;
+                                document.getWindow().focus();
                         }
                 }