MDL-77375 output: Deprecate action_menu::set_constraint()

lib/outputcomponents.php

@@ -4654,10 +4654,12 @@ public function set_menu_left() {
      * This is required whenever the action menu is displayed inside any CSS element with the .no-overflow class
      * (flexible_table and any of it's child classes are a likely candidate).
      *
+     * @deprecated since Moodle 4.3
      * @param string $ancestorselector A snippet of CSS used to identify the ancestor to contrain the dialogue to.
      */
     public function set_constraint($ancestorselector) {
-        $this->attributessecondary['data-constraint'] = $ancestorselector;
+        debugging('The method set_constraint() is deprecated. Please use the set_boundary() method instead.', DEBUG_DEVELOPER);
+        $this->set_boundary('window');
     }
 
     /**

lib/upgrade.txt

@@ -35,6 +35,7 @@ information provided here is intended especially for developers.
 * Introduce a new public function \core_external\util::generate_token_name()
 * Legacy (and custom) Behat --skip-passed option has been removed completely. Please, use the standard
   --rerun option that provides exactly the same (execution of failed scenarios only).
+* The action_menu::set_constraint() method is deprecated. Please use action_menu::set_boundary() instead.
 
 === 4.2 ===