[FIX] ie11 support (#16682)

app/ui-sidenav/client/userPresence.js

@@ -67,7 +67,9 @@ const handleEntries = function(entries) {
 	getAll();
 };
 
-const observer = new IntersectionObserver(handleEntries, options);
+const featureExists = !!window.IntersectionObserver;
+
+const observer = featureExists && new IntersectionObserver(handleEntries, options);
 
 Tracker.autorun(() => {
 	if (!Meteor.userId() || !Meteor.status().connected) {
@@ -75,13 +77,23 @@ Tracker.autorun(() => {
 	}
 	mem.clear(get);
 
+	if (featureExists) {
 		for (const node of data.keys()) {
 			observer.unobserve(node);
 			observer.observe(node);
 		}
+	}
+
+	get(this.data.uid);
+	getAll();
 });
 
 Template.userPresence.onRendered(function() {
 	data.set(this.firstNode, this.data);
-	observer.observe(this.firstNode);
+	if (featureExists) {
+		return observer.observe(this.firstNode);
+	}
+
+	get(this.data.uid);
+	getAll();
 });

imports/client/query-string

@@ -0,0 +1 @@
+../../node_modules/query-string/

imports/client/scheduler

@@ -0,0 +1 @@
+../../node_modules/scheduler/

imports/client/split-on-first

@@ -0,0 +1 @@
+../../node_modules/split-on-first/

imports/client/strict-uri-encode

@@ -0,0 +1 @@
+../../node_modules/strict-uri-encode/