Lazy-load the user list to improve perf

Still slow when typing due to adding 1000 tiles to the DOM, but it is at least
a lot better than before (which would stutter on ANY change to the member list)

src/components/views/rooms/EntityTile.js

@@ -121,7 +121,7 @@ module.exports = React.createClass({
         var MemberAvatar = sdk.getComponent('avatars.MemberAvatar');
         var BaseAvatar = sdk.getComponent('avatars.BaseAvatar');
 
-        var av = this.props.avatarJsx || <BaseAvatar name={name} width={36} height={36} />;
+        var av = this.props.avatarJsx || <BaseAvatar name={this.props.name} width={36} height={36} />;
 
         return (
             <div className={mainClassName} title={ this.props.title }

src/components/views/rooms/MemberList.js

@@ -71,8 +71,19 @@ module.exports = React.createClass({
             self.setState({
                 members: self.roomMembers()
             });
+            // Lazy-load the complete user list for inviting new users
+            // TODO: Keep this list bleeding-edge up-to-date. Practically speaking,
+            // it will do for now not being updated as random new users join different
+            // rooms as this list will be reloaded every room swap.
+            var room = MatrixClientPeg.get().getRoom(self.props.roomId);
+            self.userList = MatrixClientPeg.get().getUsers().filter(function(u) {
+                return !room.hasMembershipState(u.userId, "join");
+            });
         }, 50);
 
+        
+        setTimeout
+
         // Attach a SINGLE listener for global presence changes then locate the
         // member tile and re-render it. This is more efficient than every tile
         // evar attaching their own listener.
@@ -323,20 +334,13 @@ module.exports = React.createClass({
                 <Loader />
             );
         } else {
-            // TODO: Cache this calculation
-            var room = MatrixClientPeg.get().getRoom(this.props.roomId);
-            /* var allUsers = MatrixClientPeg.get().getUsers();
-            // only add Users if they are not joined
-            allUsers = allUsers.filter(function(u) {
-                return !room.hasMembershipState(u.userId, "join");
-            }); */
             var SearchableEntityList = sdk.getComponent("rooms.SearchableEntityList");
             
             return (
                 <SearchableEntityList searchPlaceholderText={"Invite / Search"}
                     onSubmit={this.onInvite}
                     onQueryChanged={this.onSearchQueryChanged}
-                    entities={[] /* Entities.fromUsers(allUsers, true, this.onInvite) */} />
+                    entities={Entities.fromUsers(this.userList || [], true, this.onInvite)} />
             );
         }
     },

src/components/views/rooms/SearchableEntityList.js

@@ -50,6 +50,12 @@ var SearchableEntityList = React.createClass({
         };
     },
 
+    componentWillUnmount: function() {
+        // pretend the query box was blanked out else filters could still be
+        // applied to other components which rely on onQueryChanged.
+        this.props.onQueryChanged("");
+    },
+
     /**
      * Public-facing method to set the input query text to the given input.
      * @param {string} input