Ticket #51743: 51743.3.diff

src/wp-admin/includes/schema.php

@@ -535 +535 @@
                 'disallowed_keys'                 => '',
                 'comment_previously_approved'     => 1,
                 'auto_plugin_theme_update_emails' => array(),
+
+                // 5.6.0
+                'auto_update_core_dev'            => 'enabled',
+                'auto_update_core_minor'          => 'enabled',
+                // Default to enabled for new installs.
+                // See https://core.trac.wordpress.org/ticket/51742.
+                'auto_update_core_major'          => 'enabled',
         );
 
         // 3.3.0

src/wp-admin/includes/upgrade.php

@@ -874 +874 @@
                 upgrade_550();
         }
 
+        if ( $wp_current_db_version < 49534 ) {
+                upgrade_560();
+        }
+
         maybe_disable_link_manager();
 
         maybe_disable_automattic_widgets();
@@ -2237 +2241 @@
 }
 
 /**
+ * Executes changes made in WordPress 5.6.0.
+ *
+ * @ignore
+ * @since 5.6.0
+ */
+function upgrade_560() {
+        // When upgrading from WP < 5.6.0 set the core major auto-updates option to `unset` by default.
+        // This overrides the same option from populate_options() that is intended for new installs.
+        // See https://core.trac.wordpress.org/ticket/51742.
+        update_option( 'auto_update_core_major', 'unset' );
+}
+
+/**
  * Executes network-level upgrade routines.
  *
  * @since 3.0.0