Trim spurious whitespace of "Explore rooms" menu input (#7431)

* Trim spurious whitespace of "Explore rooms" menu input

Trims the whitespace around the input string in order to
show relevant room suggestions and the "Join" button.

Fixes element-hq/element-web#19728

Signed-off by: Ingrid Budau inigiri@posteo.jp

* Add safe navigation

Co-authored-by: Travis Ralston <travpc@gmail.com>

Co-authored-by: Travis Ralston <travpc@gmail.com>

src/components/structures/RoomDirectory.tsx

@@ -393,7 +393,7 @@ export default class RoomDirectory extends React.Component<IProps, IState> {
 
     private onFilterChange = (alias: string) => {
         this.setState({
-            filterString: alias || "",
+            filterString: alias?.trim() || "",
         });
 
         // don't send the request for a little bit,