From 2dbeea31a089698aa01207a7c2855c42bb3d2d7e Mon Sep 17 00:00:00 2001
From: Erik Ziegler <erik.sweed@gmail.com>
Date: Wed, 10 Aug 2016 10:56:44 +0200
Subject: [PATCH] Prevent unnecessary layoutManager update when toggling
 enlargement

---
 Packages/viewerbase/lib/layoutManager.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Packages/viewerbase/lib/layoutManager.js b/Packages/viewerbase/lib/layoutManager.js
index ec2acf755..00ff9da0b 100644
--- a/Packages/viewerbase/lib/layoutManager.js
+++ b/Packages/viewerbase/lib/layoutManager.js
@@ -213,7 +213,11 @@ LayoutManager = class LayoutManager {
         if (this.isZoomed) {
             this.resetPreviousLayout();
         } else {
-            this.enlargeViewport(viewportIndex);
+            // Don't enlarge the viewport if we only have one Viewport
+            // to begin with
+            if (this.getNumberOfViewports() > 1) {
+                this.enlargeViewport(viewportIndex);    
+            }
         }
     }
 };