fix embarassing bug where in-progress messages get vaped when the previous one gets delivered

webclient/room/room-controller.js

@@ -485,7 +485,9 @@ angular.module('RoomController', ['ngSanitize', 'matrixFilter', 'mFileInput'])
             promise.then(
                 function() {
                     console.log("Request successfully sent");
+                    if (!echo) {
                         $scope.textInput = "";
+                    }
 /*
                     if (echoMessage) {
                         // Remove the fake echo message from the room messages