Ticket #27320: 27320.4.diff

src/wp-includes/class-wp-editor.php

@@ -345 +345 @@
                                 $dashicons = includes_url( "css/dashicons$suffix.css?$version" );
                                 $mediaelement = includes_url( "js/mediaelement/mediaelementplayer.min.css?$version" );
                                 $wpmediaelement = includes_url( "js/mediaelement/wp-mediaelement.css?$version" );
-                                
+
                                 // WordPress default stylesheet and dashicons
                                 $mce_css = array(
                                         $dashicons,
                                         $mediaelement,
                                         $wpmediaelement,
-                                        self::$baseurl . '/skins/wordpress/wp-content.css'
+                                        self::$baseurl . '/skins/wordpress/wp-content.css?' . $version
                                 );
 
                                 // load editor_style.css if the current theme supports it