From 080b0f661e456fd320f215071a3a1191f09daba6 Mon Sep 17 00:00:00 2001
From: Joshua Walsh <josh@ymindustries.com>
Date: Wed, 26 Jul 2017 23:22:28 +1000
Subject: [PATCH] Fixed #3249 (#3250)

Only draw non-visible items once when they are loaded, instead of continuously every frame
---
 lib/timeline/component/Group.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/timeline/component/Group.js b/lib/timeline/component/Group.js
index 79ccf60d..2f357e3b 100644
--- a/lib/timeline/component/Group.js
+++ b/lib/timeline/component/Group.js
@@ -257,7 +257,7 @@ Group.prototype.redraw = function(range, margin, forceRestack) {
       var me = this;
       var limitSize = false;
       util.forEach(this.items, function (item) {
-        if (!item.displayed) {
+        if (!item.dom) { // If this item has never been displayed then the dom property will not be defined, this means we need to measure the size
           item.redraw();
           me.visibleItems.push(item);
         }