disable editor history/persistence when in grid to avoid pesky bug

src/components/structures/RoomView.js

@@ -1690,6 +1690,7 @@ module.exports = React.createClass({
                 <MessageComposer
                     roomViewStore={this.props.roomViewStore}
                     room={this.state.room}
+                    isGrid={this.props.isGrid}
                     onResize={this.onChildResize}
                     uploadFile={this.uploadFile}
                     callState={this.state.callState}

src/components/views/rooms/MessageComposer.js

@@ -359,6 +359,7 @@ export default class MessageComposer extends React.Component {
                     roomViewStore={this.props.roomViewStore}
                     ref={(c) => this.messageComposerInput = c}
                     key="controls_input"
+                    isGrid={this.props.isGrid}
                     onResize={this.props.onResize}
                     room={this.props.room}
                     placeholder={placeholderText}

src/components/views/rooms/MessageComposerInput.js

@@ -132,6 +132,18 @@ function rangeEquals(a: Range, b: Range): boolean {
         && a.isBackward === b.isBackward);
 }
 
+class NoopHistoryManager {
+    getItem() {}
+    save() {}
+
+    get currentIndex() { return 0; }
+    set currentIndex(_) {}
+
+    get history() { return []; }
+    set history(_) {}
+}
+
+
 /*
  * The textInput part of the MessageComposer
  */
@@ -343,8 +355,15 @@ export default class MessageComposerInput extends React.Component {
 
     componentWillMount() {
         this.dispatcherRef = this.props.roomViewStore.getDispatcher().register(this.onAction);
+        if (this.props.isGrid) {
+
+
+
+            this.historyManager = new NoopHistoryManager();
+        } else {
             this.historyManager = new ComposerHistoryManager(this.props.room.roomId, 'mx_slate_composer_history_');
         }
+    }
 
     componentWillUnmount() {
         this.props.roomViewStore.getDispatcher().unregister(this.dispatcherRef);