Room List v2 Enter in the filter field should select the first result

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

src/components/structures/LeftPanel2.tsx

@@ -274,6 +274,14 @@ export default class LeftPanel2 extends React.Component<IProps, IState> {
         }
     };
 
+    private onEnter = () => {
+        const firstRoom = this.listContainerRef.current.querySelector<HTMLDivElement>(".mx_RoomTile2");
+        if (firstRoom) {
+            firstRoom.click();
+            this.onSearch(""); // clear the search field
+        }
+    };
+
     private onMoveFocus = (up: boolean) => {
         let element = this.focusedElement;
 
@@ -346,6 +354,7 @@ export default class LeftPanel2 extends React.Component<IProps, IState> {
                     onQueryUpdate={this.onSearch}
                     isMinimized={this.props.isMinimized}
                     onVerticalArrow={this.onKeyDown}
+                    onEnter={this.onEnter}
                 />
                 <AccessibleButton
                     className="mx_LeftPanel2_exploreButton"

src/components/structures/RoomSearch.tsx

@@ -39,6 +39,7 @@ interface IProps {
     onQueryUpdate: (newQuery: string) => void;
     isMinimized: boolean;
     onVerticalArrow(ev: React.KeyboardEvent);
+    onEnter(ev: React.KeyboardEvent);
 }
 
 interface IState {
@@ -115,6 +116,8 @@ export default class RoomSearch extends React.PureComponent<IProps, IState> {
             defaultDispatcher.fire(Action.FocusComposer);
         } else if (ev.key === Key.ARROW_UP || ev.key === Key.ARROW_DOWN) {
             this.props.onVerticalArrow(ev);
+        } else if (ev.key === Key.ENTER) {
+            this.props.onEnter(ev);
         }
     };