Ticket #54955: 54995.2.patch

src/js/_enqueues/lib/ajax-response.js

@@ -27 +27 @@
                                 var th = jQuery(this), child = jQuery(this.firstChild), response;
                                 response = { action: th.attr('action'), what: child.get(0).nodeName, id: child.attr('id'), oldId: child.attr('old_id'), position: child.attr('position') };
                                 response.data = jQuery( 'response_data', child ).text();
-                                successmsg += response.data;
+                                if ( jQuery( 'body' ).hasClass( 'edit-tags-php' ) ) {
+                                        successmsg += response.data;
+                                }
                                 response.supplemental = {};
                                 if ( !jQuery( 'supplemental', child ).children().each( function() {
                                         response.supplemental[this.nodeName] = jQuery(this).text();
@@ -50 +52 @@
                         if ( err.length ) {
                                 re.html( '<div class="error">' + err + '</div>' );
                                 wp.a11y.speak( err );
-                        } else {
+                        } else if ( successmsg.length ) {
                                 re.html( '<div class="updated notice is-dismissible"><p>' + successmsg + '</p></div>');
                                 jQuery(document).trigger( 'wp-updates-notice-added' );
                                 wp.a11y.speak( successmsg );