Ticket #29137: editor_stylesheets-filter.diff

theme.php

@@ -1412 +1412 @@
  * @return array If registered, a list of editor stylesheet URLs.
  */
 function get_editor_stylesheets() {
+        /**
+         * Filter editor stylesheets output.
+         *
+         * @since 4.0.0
+         *
+         * @param array  array()  Array of stylesheets URLs.
+         */
+        if ( $out = apply_filters( 'editor_stylesheets', array() ) ) {
+                return $out;
+        }
+
         $stylesheets = array();
         // load editor_style.css if the current theme supports it
         if ( ! empty( $GLOBALS['editor_styles'] ) && is_array( $GLOBALS['editor_styles'] ) ) {