Updates #1098 IE doesn't support `document.contains`

src/converse-bookmarks.js

@@ -469,8 +469,7 @@
 
                 insertIntoControlBox () {
                     const controlboxview = _converse.chatboxviews.get('controlbox');
-                    if (!_.isUndefined(controlboxview) &&
-                            !_converse.root.contains(this.el)) {
+                    if (!_.isUndefined(controlboxview) && !u.rootContains(_converse.root, this.el)) {
                         const el = controlboxview.el.querySelector('.bookmarks-list');
                         if (!_.isNull(el)) {
                             el.parentNode.replaceChild(this.el, el);

src/converse-roomslist.js

@@ -181,8 +181,7 @@
 
                 insertIntoControlBox () {
                     const controlboxview = _converse.chatboxviews.get('controlbox');
-                    if (!_.isUndefined(controlboxview) &&
-                            !_converse.root.contains(this.el)) {
+                    if (!_.isUndefined(controlboxview) && !u.rootContains(_converse.root, this.el)) {
                         const el = controlboxview.el.querySelector('.open-rooms-list');
                         if (!_.isNull(el)) {
                             el.parentNode.replaceChild(this.el, el);

src/utils/core.js

@@ -654,6 +654,14 @@
         };
     };
 
+    u.rootContains = function (root, el) {
+        // The document element does not have the contains method in IE.
+        if (root === document && !root.contains) {
+            return document.head.contains(el) || document.body.contains(el);
+        }
+        return root.contains ? root.contains(el) : window.HTMLElement.prototype.contains.call(root, el);
+    };
+
     u.createFragmentFromText = function (markup) {
         /* Returns a DocumentFragment containing DOM nodes based on the
          * passed-in markup text.