Ticket #29425: 29425.diff

src/wp-admin/includes/class-wp-upgrader.php

@@ -1252 +1252 @@
 
                 if ( empty( $language_updates ) ) {
                         $this->skin->header();
                         $this->skin->before();
                         $this->skin->set_result( true );
                         $this->skin->feedback( 'up_to_date' );
                         $this->skin->after();
                         $this->skin->bulk_footer();
                         $this->skin->footer();
                         return true;
                 }
 
                 if ( 'upgrader_process_complete' == current_filter() )
                         $this->skin->feedback( 'starting_upgrade' );
 
-                // Remove any existing package checks and then set the new one for translations, #WP29230.
+                // Remove any existing upgrade filters from the plugin/theme upgraders #WP29425 & #WP29230
+                remove_all_filters( 'upgrader_pre_install' );
+                remove_all_filters( 'upgrader_clear_destination' );
+                remove_all_filterS( 'upgrader_post_install' );
                 remove_all_filters( 'upgrader_source_selection' );
+
                 add_filter( 'upgrader_source_selection', array( $this, 'check_package' ), 10, 2 );
 
                 $this->skin->header();
 
                 // Connect to the Filesystem first.
                 $res = $this->fs_connect( array( WP_CONTENT_DIR, WP_LANG_DIR ) );
                 if ( ! $res ) {
                         $this->skin->footer();
                         return false;
                 }
 
                 $results = array();
 
                 $this->update_count = count( $language_updates );
                 $this->update_current = 0;