request messages when subscribing to a new topic

src/views/messages-view.jsx

@@ -122,17 +122,22 @@ class MessagesView extends React.Component {
 
     if (topic && !topic.isSubscribed() && this.props.ready &&
         ((this.state.topic != prevState.topic) || !prevProps.ready)) {
+      // Is this a new topic?
+      const newTopic = (this.props.newTopicParams && this.props.newTopicParams._topicName == this.props.topic);
+
       // Don't request the tags. They are useless unless the user
       // is the owner and is editing the topic.
       let getQuery = topic.startMetaQuery().withLaterDesc().withLaterSub();
-      if (this.state.isReader) {
-        // If reading is permitted, ask for messages.
-        getQuery = getQuery.withLaterData(MESSAGES_PAGE).withLaterDel();
+      if (this.state.isReader || newTopic) {
+        // If reading is either permitted or we don't know because it's a new topic. Ask for messages.
+        getQuery = getQuery.withLaterData(MESSAGES_PAGE);
+        if (this.state.isReader) {
+          getQuery = getQuery.withLaterDel();
+        }
         // And show "loading" spinner.
         this.setState({ fetchingMessages: true });
       }
-      const setQuery = (this.props.newTopicParams && this.props.newTopicParams._topicName == this.props.topic) ?
-        this.props.newTopicParams : undefined;
+      const setQuery = newTopic ? this.props.newTopicParams : undefined;
       topic.subscribe(getQuery.build(), setQuery)
         .then((ctrl) => {
           if (this.state.topic != ctrl.topic) {

umd/index.dev.js

@@ -2716,16 +2716,22 @@ var MessagesView = function (_React$Component) {
       }
 
       if (topic && !topic.isSubscribed() && this.props.ready && (this.state.topic != prevState.topic || !prevProps.ready)) {
+        var newTopic = this.props.newTopicParams && this.props.newTopicParams._topicName == this.props.topic;
         var getQuery = topic.startMetaQuery().withLaterDesc().withLaterSub();
 
-        if (this.state.isReader) {
-          getQuery = getQuery.withLaterData(_config_js__WEBPACK_IMPORTED_MODULE_12__["MESSAGES_PAGE"]).withLaterDel();
+        if (this.state.isReader || newTopic) {
+          getQuery = getQuery.withLaterData(_config_js__WEBPACK_IMPORTED_MODULE_12__["MESSAGES_PAGE"]);
+
+          if (this.state.isReader) {
+            getQuery = getQuery.withLaterDel();
+          }
+
           this.setState({
             fetchingMessages: true
           });
         }
 
-        var setQuery = this.props.newTopicParams && this.props.newTopicParams._topicName == this.props.topic ? this.props.newTopicParams : undefined;
+        var setQuery = newTopic ? this.props.newTopicParams : undefined;
         topic.subscribe(getQuery.build(), setQuery).then(function (ctrl) {
           if (_this2.state.topic != ctrl.topic) {
             _this2.setState({