Version 4.7.0

system/Member/Group.php

@@ -238,6 +238,9 @@ class _Group extends \IPS\Patterns\ActiveRecord
 		unset( \IPS\Data\Store::i()->applications );
 		unset( \IPS\Data\Store::i()->modules );
 		unset( \IPS\Data\Store::i()->groups );
+
+		/* Rebuild search index */
+		\IPS\Content\Search\Index::i()->rebuild();
 	}
 	
 	/**
@@ -393,6 +396,29 @@ class _Group extends \IPS\Patterns\ActiveRecord
 
 		/* Update Core Leaders */
 		\IPS\core\StaffDirectory\User::updateEmptySetting();
+
+		/* Deleted group, expire widget caches (online stats may try to load a group) */
+		\IPS\Widget::deleteCaches();
+	}
+
+	/**
+	 * Can this group be deleted?
+	 *
+	 * @return bool
+	 */
+	public function canDelete() : bool
+	{
+		$extensions = \IPS\Application::allExtensions( 'core', 'GroupForm', FALSE, 'core', 'GroupSettings', TRUE );
+
+		foreach ( $extensions as $class )
+		{
+			if( method_exists( $class, 'canDelete' ) AND !$class->canDelete( $this ) )
+			{
+				return FALSE;
+			}
+		}
+
+		return TRUE;
 	}
 
 	/**