Ticket #30646: 30646.patch

src/wp-includes/js/mce-view.js

@@ -207 +207 @@
                                                 iframeDoc.close();
 
                                                 resize = function() {
+                                                        var $iframe, iframeDocHeight;
+
                                                         // Make sure the iframe still exists.
-                                                        iframe.contentWindow && $( iframe ).height( $( iframeDoc.body ).height() );
+                                                        if ( iframe.contentWindow ) {
+                                                                $iframe = $( iframe );
+                                                                iframeDocHeight = $( iframeDoc.body ).height();
+
+                                                                if ( $iframe.height() !== iframeDocHeight ) {
+                                                                        $iframe.height( iframeDocHeight );
+                                                                        editor.nodeChanged();
+                                                                }
+                                                        }
                                                 };
 
                                                 if ( MutationObserver ) {