Fix the permagrey local-echo bug

src/controllers/molecules/MessageComposer.js

@@ -54,7 +54,11 @@ module.exports = {
                 };
             }
 
-            MatrixClientPeg.get().sendMessage(this.props.roomId, content);
+            MatrixClientPeg.get().sendMessage(this.props.roomId, content).then(function() {
+                dis.dispatch({
+                    action: 'message_sent'
+                });
+            });
             this.refs.textarea.getDOMNode().value = '';
             ev.preventDefault();
         }

src/controllers/organisms/RoomView.js

@@ -18,6 +18,8 @@ limitations under the License.
 
 var MatrixClientPeg = require("../../MatrixClientPeg");
 
+var dis = require("../../dispatcher");
+
 var PAGINATE_SIZE = 20;
 
 module.exports = {
@@ -28,16 +30,28 @@ module.exports = {
     },
 
     componentWillMount: function() {
+        this.dispatcherRef = dis.register(this.onAction);
         MatrixClientPeg.get().on("Room.timeline", this.onRoomTimeline);
         this.atBottom = true;
     },
 
     componentWillUnmount: function() {
+        dis.unregister(this.dispatcherRef);
         if (MatrixClientPeg.get()) {
             MatrixClientPeg.get().removeListener("Room.timeline", this.onRoomTimeline);
         }
     },
 
+    onAction: function(payload) {
+        switch (payload.action) {
+            case 'message_sent':
+                this.setState({
+                    room: MatrixClientPeg.get().getRoom(this.props.roomId)
+                });
+                break;
+        }
+    },
+
     // MatrixRoom still showing the messages from the old room?
     // Set the key to the room_id. Sadly you can no longer get at
     // the key from inside the component, or we'd check this in code.