Taxonomy: Correct the check for error messages in wp-admin/edit-tag-form.php.

Instead of checking for a specific message, e.g. “Item not updated”, the `$_REQUEST['error']` variable is now checked. This allows for custom messages added via the `term_updated_messages` filter to be considered an error when appropriate, and displayed with the correct CSS class.

This also brings consistency with a similar check in `wp-admin/edit-tags.php`.

Follow-up to [31823], [44663].

Props xipasduarte.
Fixes #61896.

git-svn-id: https://develop.svn.wordpress.org/trunk@58918 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

src/wp-admin/edit-tag-form.php

@@ -72,7 +72,7 @@
 <h1><?php echo $tax->labels->edit_item; ?></h1>
 
 <?php
-$class = ( isset( $msg ) && 5 === $msg ) ? 'error' : 'success';
+$class = ( isset( $_REQUEST['error'] ) ) ? 'error' : 'success';
 
 if ( $message ) {
 	$message = '<p><strong>' . $message . '</strong></p>';
@@ -83,6 +83,7 @@
 			esc_html( $tax->labels->back_to_items )
 		);
 	}
+
 	wp_admin_notice(
 		$message,
 		array(

src/wp-admin/edit-tags.php

@@ -321,8 +321,6 @@
 // Also used by the Edit Tag form.
 require_once ABSPATH . 'wp-admin/includes/edit-tag-messages.php';
 
-$class = ( isset( $_REQUEST['error'] ) ) ? 'error' : 'updated';
-
 if ( is_plugin_active( 'wpcat2tag-importer/wpcat2tag-importer.php' ) ) {
 	$import_link = admin_url( 'admin.php?import=wpcat2tag' );
 } else {
@@ -349,7 +347,9 @@
 <hr class="wp-header-end">
 
 <?php
-if ( $message ) :
+$class = ( isset( $_REQUEST['error'] ) ) ? 'error' : 'updated';
+
+if ( $message ) {
 	wp_admin_notice(
 		$message,
 		array(
@@ -358,8 +358,9 @@
 			'dismissible'        => true,
 		)
 	);
+
 	$_SERVER['REQUEST_URI'] = remove_query_arg( array( 'message', 'error' ), $_SERVER['REQUEST_URI'] );
-endif;
+}
 ?>
 <div id="ajax-response"></div>