From c68b82339ce170fe67408d8d2343cab4c7a264b6 Mon Sep 17 00:00:00 2001
From: juliandescottes <julian.descottes@gmail.com>
Date: Sat, 11 Feb 2017 16:51:27 +0100
Subject: [PATCH] remove classList toggle with 2nd argument for IE11

---
 src/js/controller/UserWarningController.js     |  6 +++++-
 src/js/controller/preview/PreviewController.js | 16 ++++++++++++++--
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/src/js/controller/UserWarningController.js b/src/js/controller/UserWarningController.js
index c1b62147..423a372f 100644
--- a/src/js/controller/UserWarningController.js
+++ b/src/js/controller/UserWarningController.js
@@ -38,7 +38,11 @@
     var isWarningDisplayed = this.performanceLinkEl.classList.contains('visible');
 
     // Show/hide the performance warning link depending on the received report.
-    this.performanceLinkEl.classList.toggle('visible', shouldDisplayWarning);
+    if (shouldDisplayWarning) {
+      this.performanceLinkEl.classList.add('visible');
+    } else {
+      this.performanceLinkEl.classList.remove('visible');
+    }
 
     // Show a notification message if the new report indicates a performance issue
     // and we were not displaying a warning before.
diff --git a/src/js/controller/preview/PreviewController.js b/src/js/controller/preview/PreviewController.js
index ee624436..a7bb7dfc 100644
--- a/src/js/controller/preview/PreviewController.js
+++ b/src/js/controller/preview/PreviewController.js
@@ -124,7 +124,13 @@
       if (this.previewSizes.hasOwnProperty(size)) {
         var previewSize = this.previewSizes[size];
         var isSizeEnabled = validSizes.indexOf(size) != -1;
-        previewSize.button.classList.toggle('preview-contextual-action-hidden', !isSizeEnabled);
+
+        // classList.toggle is not available on IE11.
+        if (isSizeEnabled) {
+          previewSize.button.classList.remove('preview-contextual-action-hidden');
+        } else {
+          previewSize.button.classList.add('preview-contextual-action-hidden');
+        }
       }
     }
 
@@ -174,7 +180,13 @@
   ns.PreviewController.prototype.updateOnionSkinPreview_ = function () {
     var enabledClassname = 'preview-toggle-onion-skin-enabled';
     var isEnabled = pskl.UserSettings.get(pskl.UserSettings.ONION_SKIN);
-    this.toggleOnionSkinButton.classList.toggle(enabledClassname, isEnabled);
+
+    // classList.toggle is not available on IE11.
+    if (isEnabled) {
+      this.toggleOnionSkinButton.classList.add(enabledClassname);
+    } else {
+      this.toggleOnionSkinButton.classList.remove(enabledClassname);
+    }
   };
 
   ns.PreviewController.prototype.selectPreviewSizeButton_ = function () {