do inscremental updates instead of full updates

src/lib/utils.js

@@ -2,23 +2,24 @@
 
 // Make shortcut icon appear with a green dot + show unread count in title.
 export function updateFavicon(count) {
-  var oldIcon = document.getElementById('shortcut-icon');
+  const oldIcon = document.getElementById('shortcut-icon');
+  const head = document.head || document.getElementsByTagName('head')[0];
+  const newIcon = document.createElement('link');
+  newIcon.type = 'image/png';
+  newIcon.id = 'shortcut-icon';
+  newIcon.rel = 'shortcut icon';
+  newIcon.href = 'img/logo32x32' + (count > 0 ? 'a' : '') + '.png';
   if (oldIcon) {
-    var head = document.head || document.getElementsByTagName('head')[0];
-    var newIcon = document.createElement('link');
-    newIcon.type = 'image/png';
-    newIcon.id = 'shortcut-icon';
-    newIcon.rel = 'shortcut icon';
-    newIcon.href = 'img/logo32x32' + (count > 0 ? 'a' : '') + '.png';
     head.removeChild(oldIcon);
-    head.appendChild(newIcon);
   }
+  head.appendChild(newIcon);
+
   document.title = (count > 0 ? '('+count+') ' : '') + 'Tinode';
 }
 
 // Create VCard which represents topic 'public' info
 export function vcard(fn, imageDataUrl) {
-  var card = null;
+  const card = null;
 
   if ((fn && fn.trim()) || imageDataUrl) {
     card = {};
@@ -26,7 +27,7 @@ export function vcard(fn, imageDataUrl) {
       card.fn = fn.trim();
     }
     if (imageDataUrl) {
-      var dataStart = imageDataUrl.indexOf(',');
+      const dataStart = imageDataUrl.indexOf(',');
       card.photo = {
         data: imageDataUrl.substring(dataStart+1),
         type: 'jpg'
@@ -38,6 +39,14 @@ export function vcard(fn, imageDataUrl) {
 
 // Deep-shallow compare two arrays: shallow compare each element.
 export function arrayEqual(a, b) {
+  if (a === b) {
+    return true;
+  }
+
+  if (!Array.isArray(a) || !Array.isArray(b)) {
+    return false;
+  }
+
   // Compare lengths first.
   if (a.length != b.length) {
     return false;
@@ -45,7 +54,7 @@ export function arrayEqual(a, b) {
   // Order of elements is ignored.
   a.sort();
   b.sort();
-  for (var i = 0, l = a.length; i < l; i++) {
+  for (let i = 0, l = a.length; i < l; i++) {
     if (a[i] !== b[i]) {
       return false;
     }

src/views/edit-account-view.jsx

@@ -60,7 +60,7 @@ export default class EditAccountView extends React.Component {
 
   handleFullNameUpdate(fn) {
     this.setState({fullName: fn});
-    this.props.onUpdateAccount(undefined, vcard(fn, this.state.avatar));
+    this.props.onUpdateAccount(undefined, vcard(fn, null));
   }
 
   handlePasswordUpdate(pwd) {
@@ -70,7 +70,7 @@ export default class EditAccountView extends React.Component {
 
   handleImageChanged(img) {
     this.setState({avatar: img});
-    this.props.onUpdateAccount(undefined, vcard(this.state.fullName, img));
+    this.props.onUpdateAccount(undefined, vcard(null, img));
   }
 
   handleCheckboxClick(what, checked) {

src/views/info-view.jsx

@@ -220,26 +220,20 @@ class InfoView extends React.Component {
     fn = fn.trim();
     if (this.state.fullName !== fn) {
       this.setState({fullName: fn});
-      this.props.onTopicDescUpdate(this.props.topic,
-        vcard(fn, this.state.avatar),
-        null);
+      this.props.onTopicDescUpdate(this.props.topic, vcard(fn, null), null);
     }
   }
 
   handlePrivateUpdate(priv) {
     if (this.state.priv !== priv) {
       this.setState({private: priv});
-      this.props.onTopicDescUpdate(this.props.topic,
-        null,
-        priv || Tinode.DEL_CHAR);
+      this.props.onTopicDescUpdate(this.props.topic, null, priv || Tinode.DEL_CHAR);
     }
   }
 
   handleImageChanged(img) {
     this.setState({avatar: img});
-    this.props.onTopicDescUpdate(this.props.topic,
-      vcard(this.state.fullName, img),
-      null);
+    this.props.onTopicDescUpdate(this.props.topic, vcard(null, img), null);
   }
 
   handleMuted(ignored, checked) {