N°4481 - Fix n:n link addition when there are more than 3+ ext. keys on the link class

sources/application/UI/Links/Indirect/BlockIndirectLinksEdit/BlockIndirectLinksEdit.php

@@ -43,6 +43,8 @@ class BlockIndirectLinksEdit extends UIContentBlock
 	public $sExtKeyToRemote;
 	/** @var bool */
 	public $bJSDoSearch;
+	/** @var int */
+	public $iMaxAddedId = 0;
 
 	/** @var string */
 	public $sFormPrefix;