fix(TextRange): use sectionRef for key only if the ref is cached, oth…

…erwise, use sref.

static/js/TextColumn.jsx

@@ -395,7 +395,7 @@ class TextColumn extends Component {
         unsetTextHighlight={this.props.unsetTextHighlight}
         navigatePanel={this.props.navigatePanel}
         translationLanguagePreference={this.props.translationLanguagePreference}
-        key={oref.sectionRef} />);
+        key={sref || oref.sectionRef} />);
     });
 
     let pre, post, bookTitle;