Initial work on improving invite dialog

src/components/views/dialogs/ChatInviteDialog.js

@@ -167,11 +167,21 @@ module.exports = React.createClass({
         const query = ev.target.value;
         let queryList = [];
 
+        if (query.length < 2) {
+            return;
+        }
+
+        if (this.queryChangedDebouncer) {
+            clearTimeout(this.queryChangedDebouncer);
+        }
+        this.queryChangedDebouncer = setTimeout(() => {
             // Only do search if there is something to search
             if (query.length > 0 && query != '@') {
                 // filter the known users list
                 queryList = this._userList.filter((user) => {
                     return this._matches(query, user);
+                }).sort((userA, userB) => {
+                    return this._sortedMatches(query, userA, userB);
                 }).map((user) => {
                     // Return objects, structure of which is defined
                     // by InviteAddressType
@@ -201,11 +211,11 @@ module.exports = React.createClass({
                     }
                 }
             }
-
             this.setState({
                 queryList: queryList,
                 error: false,
             });
+        }, 200);
     },
 
     onDismissed: function(index) {
@@ -349,8 +359,8 @@ module.exports = React.createClass({
             return false;
         }
 
-        // direct prefix matches
-        if (name.indexOf(query) === 0 || uid.indexOf(query) === 0) {
+        // positional matches
+        if (name.indexOf(query) !== -1 || uid.indexOf(query) !== -1) {
             return true;
         }
 
@@ -374,6 +384,16 @@ module.exports = React.createClass({
         return false;
     },
 
+    _sortedMatches: function(query, userA, userB) {
+        if (userA.displayName.startsWith(query) || userA.userId.startsWith(query)) {
+            return -1;
+        }
+        if (userA.displayName.length === query.length) {
+            return -1;
+        }
+        return 0;
+    },
+
     _isOnInviteList: function(uid) {
         for (let i = 0; i < this.state.inviteList.length; i++) {
             if (