From 84f96574d70072fb4f4ba9f877310ae11c9f4d6b Mon Sep 17 00:00:00 2001
From: Bryan Housel <bryan@mapbox.com>
Date: Wed, 12 Dec 2018 02:07:03 -0500
Subject: [PATCH] Add `index` property to cloned object, not actual member
 object (closes #5458)

This code was adding an `index` property to each member in the relation.
Although the `index` property is ignored by the code that saves to OSM,
the extra property would make the member changed when compared by
`coreDifference`.
---
 modules/actions/add_member.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/modules/actions/add_member.js b/modules/actions/add_member.js
index 95874213c..854c8ef95 100644
--- a/modules/actions/add_member.js
+++ b/modules/actions/add_member.js
@@ -189,7 +189,7 @@ export function actionAddMember(relationId, member, memberIndex, insertPair) {
         function withIndex(arr) {
             var result = new Array(arr.length);
             for (var i = 0; i < arr.length; i++) {
-                result[i] = arr[i];
+                result[i] = _clone(arr[i]);
                 result[i].index = i;
             }
             return result;