show message editor in textual body instead of replacing event tile

src/components/views/messages/MessageEvent.js

@@ -90,6 +90,7 @@ module.exports = React.createClass({
             tileShape={this.props.tileShape}
             maxImageHeight={this.props.maxImageHeight}
             replacingEventId={this.props.replacingEventId}
+            isEditing={this.props.isEditing}
             onHeightChanged={this.props.onHeightChanged} />;
     },
 });