From 1715e1747fb8125c6127ae1b2a148e1b3bbb0d0f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Niels=20Lyngs=C3=B8?= <nsl@umbraco.dk>
Date: Fri, 6 Mar 2020 10:41:22 +0100
Subject: [PATCH] provide key on blockModel for angularJS performance
 optimization

---
 .../src/common/services/blockeditor.service.js                  | 1 +
 .../views/propertyeditors/blocklist/blocklist.component.html    | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/Umbraco.Web.UI.Client/src/common/services/blockeditor.service.js b/src/Umbraco.Web.UI.Client/src/common/services/blockeditor.service.js
index 9d0a695d02..0f87634aa6 100644
--- a/src/Umbraco.Web.UI.Client/src/common/services/blockeditor.service.js
+++ b/src/Umbraco.Web.UI.Client/src/common/services/blockeditor.service.js
@@ -152,6 +152,7 @@
                 }
 
                 var blockModel = {};
+                blockModel.key = String.CreateGuid();
                 blockModel.config = angular.copy(blockConfiguration);
                 blockModel.labelInterpolator = $interpolate(blockModel.config.label);
 
diff --git a/src/Umbraco.Web.UI.Client/src/views/propertyeditors/blocklist/blocklist.component.html b/src/Umbraco.Web.UI.Client/src/views/propertyeditors/blocklist/blocklist.component.html
index 2004becba7..05f7fff551 100644
--- a/src/Umbraco.Web.UI.Client/src/views/propertyeditors/blocklist/blocklist.component.html
+++ b/src/Umbraco.Web.UI.Client/src/views/propertyeditors/blocklist/blocklist.component.html
@@ -5,7 +5,7 @@
 
         <div ui-sortable="vm.sortableOptions" ng-model="vm.blocks">
 
-            <div ng-repeat="blockItem in vm.blocks">
+            <div ng-repeat="blockItem in vm.blocks track by blockItem.key">
 
                 <button
                     type="button"