Ticket #51296: 51296.diff

src/wp-includes/theme.php

@@ -1057 +1057 @@
          *
          * @param string $value     The new value of the theme modification.
          * @param string $old_value The current value of the theme modification.
+         * @return bool True if the value was updated, false otherwise.
          */
         $mods[ $name ] = apply_filters( "pre_set_theme_mod_{$name}", $value, $old_value );
 
         $theme = get_option( 'stylesheet' );
-        update_option( "theme_mods_$theme", $mods );
+        return update_option( "theme_mods_$theme", $mods );
 }
 
 /**