Ticket #20733: 20733.3.diff

wp-includes/class-wp-customize-manager.php

@@ -652 +652 @@
                 $ap = $a->priority;
                 $bp = $b->priority;
 
-                if ( $ap == $bp )
-                        return 0;
+                if ( $ap == $bp ) {
+                        $section_keys = array_keys( $this->sections );
+                        return array_search( $a->id, $section_keys ) < array_search( $b->id, $section_keys );
+                }
                 return ( $ap > $bp ) ? 1 : -1;
         }