Ticket #42645: 42645.2.patch

src/wp-includes/theme.php

@@ -1904 +1904 @@
  *
  * @param array|string $stylesheet Optional. Stylesheet name or array thereof, relative to theme root.
  *                                 Defaults to 'editor-style.css'
+ * @param string       $version    Optional. Add version number to stylesheet URL for cache busting.
  */
-function add_editor_style( $stylesheet = 'editor-style.css' ) {
+function add_editor_style( $stylesheet = 'editor-style.css', $version = '' ) {
         add_theme_support( 'editor-style' );
 
         if ( ! is_admin() ) {
@@ -1913 +1914 @@
         }
 
         global $editor_styles;
+        global $wp_version;
+
+        if ( '' === $version ) {
+                $version = $wp_version;
+    }
+
         $editor_styles = (array) $editor_styles;
         $stylesheet    = (array) $stylesheet;
+        $version       = (array) $version;
+
         if ( is_rtl() ) {
                 $rtl_stylesheet = str_replace( '.css', '-rtl.css', $stylesheet[0] );
                 $stylesheet[]   = $rtl_stylesheet;
         }
 
-        $editor_styles = array_merge( $editor_styles, $stylesheet );
+        $editor_styles = array_merge( $editor_styles, $stylesheet, $version );
 }
 
 /**