enhance: 招待されているが参加していないルームを開いたときに、招待を承認するかどうか尋ねるように

packages/frontend/src/pages/chat/room.vue

@@ -80,7 +80,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 						</button>
 					</div>
 				</Transition>
-				<XForm v-if="!initializing" :user="user" :room="room" :class="$style.form"/>
+				<XForm v-if="initialized" :user="user" :room="room" :class="$style.form"/>
 			</div>
 		</div>
 	</template>
@@ -127,7 +127,8 @@ export type NormalizedChatMessage = Omit<Misskey.entities.ChatMessageLite, 'from
 	})[];
 };
 
-const initializing = ref(true);
+const initializing = ref(false);
+const initialized = ref(false);
 const moreFetching = ref(false);
 const messages = ref<NormalizedChatMessage[]>([]);
 const canFetchMore = ref(false);
@@ -171,7 +172,10 @@ function normalizeMessage(message: Misskey.entities.ChatMessageLite | Misskey.en
 async function initialize() {
 	const LIMIT = 20;
 
+	if (initializing.value) return;
+
 	initializing.value = true;
+	initialized.value = false;
 
 	if (props.userId) {
 		const [u, m] = await Promise.all([
@@ -194,13 +198,44 @@ async function initialize() {
 		connection.value.on('react', onReact);
 		connection.value.on('unreact', onUnreact);
 	} else {
-		const [r, m] = await Promise.all([
+		const [rResult, mResult] = await Promise.allSettled([
 			misskeyApi('chat/rooms/show', { roomId: props.roomId }),
 			misskeyApi('chat/messages/room-timeline', { roomId: props.roomId, limit: LIMIT }),
 		]);
 
-		room.value = r as Misskey.entities.ChatRoomsShowResponse;
-		messages.value = (m as Misskey.entities.ChatMessagesRoomTimelineResponse).map(x => normalizeMessage(x));
+		if (rResult.status === 'rejected') {
+			os.alert({
+				type: 'error',
+				text: i18n.ts.somethingHappened,
+			});
+			initializing.value = false;
+			return;
+		}
+
+		const r = rResult.value as Misskey.entities.ChatRoomsShowResponse;
+
+		if (r.invitationExists) {
+			const confirm = await os.confirm({
+				type: 'question',
+				title: r.name,
+				text: i18n.ts._chat.youAreNotAMemberOfThisRoomButInvited + '\n' + i18n.ts._chat.doYouAcceptInvitation,
+			});
+			if (confirm.canceled) {
+				initializing.value = false;
+				router.push('/chat');
+				return;
+			} else {
+				await os.apiWithDialog('chat/rooms/join', { roomId: r.id });
+				initializing.value = false;
+				initialize();
+				return;
+			}
+		}
+
+		const m = mResult.status === 'fulfilled' ? mResult.value as Misskey.entities.ChatMessagesRoomTimelineResponse : [];
+
+		room.value = r;
+		messages.value = m.map(x => normalizeMessage(x));
 
 		if (messages.value.length === LIMIT) {
 			canFetchMore.value = true;
@@ -217,6 +252,7 @@ async function initialize() {
 
 	window.document.addEventListener('visibilitychange', onVisibilitychange);
 
+	initialized.value = true;
 	initializing.value = false;
 }
 
@@ -319,6 +355,12 @@ onMounted(() => {
 	initialize();
 });
 
+onActivated(() => {
+	if (!initialized.value) {
+		initialize();
+	}
+});
+
 onBeforeUnmount(() => {
 	connection.value?.dispose();
 	window.document.removeEventListener('visibilitychange', onVisibilitychange);
@@ -410,7 +452,7 @@ const headerActions = computed<PageHeaderItem[]>(() => [{
 }]);
 
 definePage(computed(() => {
-	if (!initializing.value) {
+	if (initialized.value) {
 		if (user.value) {
 			return {
 				userName: user.value,