Header Buttons switch to a fragment from an array of nodes

src/components/views/right_panel/GroupHeaderButtons.tsx

@@ -84,19 +84,21 @@ export default class GroupHeaderButtons extends HeaderButtons {
     };
 
     renderButtons() {
-        return [
+        return <>
-            <HeaderButton key="groupMembersButton" name="groupMembersButton"
+            <HeaderButton
+                name="groupMembersButton"
                 title={_t('Members')}
                 isHighlighted={this.isPhase(GROUP_PHASES)}
                 onClick={this.onMembersClicked}
                 analytics={['Right Panel', 'Group Member List Button', 'click']}
-            />,
+            />
-            <HeaderButton key="roomsButton" name="roomsButton"
+            <HeaderButton
+                name="roomsButton"
                 title={_t('Rooms')}
                 isHighlighted={this.isPhase(ROOM_PHASES)}
                 onClick={this.onRoomsClicked}
                 analytics={['Right Panel', 'Group Room List Button', 'click']}
-            />,
+            />
-        ];
+        </>;
     }
 }

src/components/views/right_panel/HeaderButtons.tsx

@@ -95,7 +95,7 @@ export default abstract class HeaderButtons extends React.Component<IProps, ISta
     }
 
     // XXX: Make renderButtons a prop
-    public abstract renderButtons(): JSX.Element[];
+    public abstract renderButtons(): JSX.Element;
 
     public render() {
         return <div className="mx_HeaderButtons">

src/components/views/right_panel/RoomHeaderButtons.tsx

@@ -81,23 +81,21 @@ export default class RoomHeaderButtons extends HeaderButtons {
     };
 
     public renderButtons() {
-        return [
+        return <>
             <HeaderButton
-                key="notifsButton"
                 name="notifsButton"
                 title={_t('Notifications')}
                 isHighlighted={this.isPhase(RightPanelPhases.NotificationPanel)}
                 onClick={this.onNotificationsClicked}
                 analytics={['Right Panel', 'Notification List Button', 'click']}
-            />,
+            />
             <HeaderButton
-                key="roomSummaryButton"
                 name="roomSummaryButton"
                 title={_t('Room Info')}
                 isHighlighted={this.isPhase(ROOM_INFO_PHASES)}
                 onClick={this.onRoomSummaryClicked}
                 analytics={['Right Panel', 'Room Summary Button', 'click']}
-            />,
+            />
-        ];
+        </>;
     }
 }