Factor out common function to generate the URLs

src/room/AppSelectionModal.tsx

@@ -21,7 +21,7 @@ import { ReactComponent as PopOutIcon } from "@vector-im/compound-design-tokens/
 
 import { Modal } from "../Modal";
 import { useRoomSharedKey } from "../e2ee/sharedKeyManagement";
-import { getRoomUrl } from "../matrix-utils";
+import { getAbsoluteRoomUrl } from "../matrix-utils";
 import styles from "./AppSelectionModal.module.css";
 import { editFragmentQuery } from "../UrlParams";
 
@@ -52,7 +52,7 @@ export const AppSelectionModal: FC<Props> = ({ roomId }) => {
     const url = new URL(
       roomId === null
         ? window.location.href
-        : getRoomUrl(roomId, undefined, roomSharedKey ?? undefined)
+        : getAbsoluteRoomUrl(roomId, undefined, roomSharedKey ?? undefined)
     );
     // Edit the URL to prevent the app selection prompt from appearing a second
     // time within the app, and to keep the user confined to the current room