D49.id.diff
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	Index: branches/5.2.x/core/units/helpers/priority_helper.php
	===================================================================
	--- branches/5.2.x/core/units/helpers/priority_helper.php
	+++ branches/5.2.x/core/units/helpers/priority_helper.php
	@@ -51,7 +51,7 @@
	$items_count = $this->Conn->GetOne($sql);
	$current_priority = $object instanceof kDBList ? 0 : $object->GetDBField('Priority');

	- if ( $is_new \|\| $current_priority == -($items_count + 1) ) {
	+ if ( $is_new \|\| $current_priority == -($items_count + 1) \|\| $this->isTempTableOnly($object) ) {
	$items_count++;
	}

	@@ -73,6 +73,22 @@
	}

	/**
	+ * Determines if an item only exists in temp table.
	+ *
	+ * @param kDBBase $object Object.
	+ *
	+ * @return boolean
	+ */
	+ protected function isTempTableOnly(kDBBase $object)
	+ {
	+ if ( !$object->IsTempTable() \|\| ($object instanceof kDBList) ) {
	+ return false;
	+ }
	+
	+ return $object->GetID() <= 0;
	+ }
	+
	+ /**
	* Updates priorities for changed items
	*
	* @param kEvent $event