don't consume all keys

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/components/structures/ContextualMenu.js

@@ -183,6 +183,8 @@ export class ContextMenu extends React.Component {
     };
 
     _onKeyDown = (ev) => {
+        let handled = true;
+
         switch (ev.key) {
             case Key.TAB:
             case Key.ESCAPE:
@@ -200,11 +202,15 @@ export class ContextMenu extends React.Component {
             case Key.END:
                 this._onMoveFocusHomeEnd(this.state.contextMenuElem, false);
                 break;
+            default:
+                handled = false;
         }
 
+        if (handled) {
             // consume all other keys in context menu
             ev.stopPropagation();
             ev.preventDefault();
+        }
     };
 
     renderMenu(hasBackground=this.props.hasBackground) {