From 9e2c7b657221c336137e07985bd5994682216d65 Mon Sep 17 00:00:00 2001
From: Russell Michell <russell@silverstripe.com>
Date: Mon, 27 Jan 2014 14:02:43 +1300
Subject: [PATCH] BUG Ensure TreeMultiSelectField doesn't populate menus with
 "unchanged". TreeMultiSelectField's default for its value property is
 'unchanged' which causes menus to not load and generates console errors.
 Fixes #2795

---
 forms/TreeDropdownField.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/forms/TreeDropdownField.php b/forms/TreeDropdownField.php
index 2c8feb690..34bf57f22 100644
--- a/forms/TreeDropdownField.php
+++ b/forms/TreeDropdownField.php
@@ -279,7 +279,7 @@ class TreeDropdownField extends FormField {
 		if( isset($_REQUEST['forceValue']) || $this->value ) {
 			$forceValue = ( isset($_REQUEST['forceValue']) ? $_REQUEST['forceValue'] : $this->value);
 			if(($values = preg_split('/,\s*/', $forceValue)) && count($values)) foreach($values as $value) {
-				if(!$value) continue;
+				if(!$value || $value == 'unchanged') continue;
 				
 				$obj->markToExpose($this->objectForKey($value));
 			}