Create dialog rows only with known folders.

Telegram/SourceFiles/data/data_folder.cpp

@@ -234,8 +234,14 @@ void Folder::requestChatListMessage() {
 	}
 }
 
+TimeId Folder::adjustedChatListTimeId() const {
+	return _chatsList.empty()
+		? TimeId(0)
+		: (*_chatsList.begin())->entry()->adjustedChatListTimeId();
+}
+
 int Folder::unreadCount() const {
-	return _unreadCount ? *_unreadCount : 0;
+	return _unreadCount.value_or(0);
 }
 
 rpl::producer<int> Folder::unreadCountValue() const {

Telegram/SourceFiles/data/data_folder.h

@@ -30,7 +30,7 @@ struct FolderUpdate {
 
 //MessagePosition FeedPositionFromMTP(const MTPFeedPosition &position); // #feed
 
-class Folder : public Dialogs::Entry {
+class Folder final : public Dialogs::Entry {
 public:
 	static constexpr auto kId = 1;
 
@@ -58,6 +58,7 @@ public:
 	//bool unreadMark() const;
 	//int unreadCountForBadge() const; // unreadCount || unreadMark ? 1 : 0.
 
+	TimeId adjustedChatListTimeId() const override;
 	int unreadCount() const;
 	bool unreadCountKnown() const;
 

Telegram/SourceFiles/data/data_session.cpp

@@ -1435,9 +1435,11 @@ void Session::addSavedPeersAfter(const QDateTime &date) {
 		saved.remove(lastDate, lastPeer);
 
 		const auto history = session().data().history(lastPeer);
+		if (!history->chatListTimeId()) {
 			history->setChatListTimeId(ServerTimeFromParsed(lastDate));
 		}
 	}
+}
 
 void Session::addAllSavedPeers() {
 	addSavedPeersAfter(QDateTime());

Telegram/SourceFiles/dialogs/dialogs_entry.cpp

@@ -91,7 +91,7 @@ void Entry::updateChatListSortPosition() {
 		? ProxyPromotedDialogPos()
 		: isPinnedDialog()
 		? PinnedDialogPos(_pinnedIndex)
-		: DialogPosFromDate(adjustChatListTimeId());
+		: DialogPosFromDate(adjustedChatListTimeId());
 	if (needUpdateInChatList()) {
 		setChatListExistence(true);
 	}
@@ -112,7 +112,7 @@ void Entry::setChatListExistence(bool exists) {
 	}
 }
 
-TimeId Entry::adjustChatListTimeId() const {
+TimeId Entry::adjustedChatListTimeId() const {
 	return chatListTimeId();
 }
 
@@ -145,13 +145,11 @@ PositionChange Entry::adjustByPosInChatList(Mode list) {
 }
 
 void Entry::setChatListTimeId(TimeId date) {
-	if (_timeId && _timeId >= date) {
-		if (!inChatList(Dialogs::Mode::All)) {
-			return;
-		}
-	}
 	_timeId = date;
 	updateChatListSortPosition();
+	if (const auto folder = this->folder()) {
+		folder->updateChatListSortPosition();
+	}
 }
 
 int Entry::posInChatList(Dialogs::Mode list) const {

Telegram/SourceFiles/dialogs/dialogs_entry.h

@@ -79,6 +79,7 @@ public:
 	void setChatListTimeId(TimeId date);
 	virtual void updateChatListExistence();
 	bool needUpdateInChatList() const;
+	virtual TimeId adjustedChatListTimeId() const;
 
 	virtual bool toImportant() const = 0;
 	virtual bool shouldBeInChatList() const = 0;
@@ -92,6 +93,9 @@ public:
 	virtual const base::flat_set<QString> &chatListNameWords() const = 0;
 	virtual const base::flat_set<QChar> &chatListFirstLetters() const = 0;
 
+	virtual bool folderKnown() const {
+		return true;
+	}
 	virtual Data::Folder *folder() const {
 		return nullptr;
 	}
@@ -119,7 +123,6 @@ public:
 	mutable Text lastItemTextCache;
 
 private:
-	virtual TimeId adjustChatListTimeId() const;
 	virtual void changedInChatListHook(Mode list, bool added);
 	virtual void changedChatListPinHook();
 

Telegram/SourceFiles/history/history.cpp

@@ -629,6 +629,9 @@ HistoryItem *History::addNewMessage(
 			setLastMessage(item);
 			if (type == NewMessageUnread) {
 				newItemAdded(item);
+				if (!folderKnown()) {
+					session().api().requestDialogEntry(this);
+				}
 			}
 			return item;
 		}
@@ -1806,8 +1809,12 @@ std::shared_ptr<AdminLog::LocalIdManager> History::adminLogIdManager() {
 	return result;
 }
 
+bool History::folderKnown() const {
+	return _folder.has_value();
+}
+
 Data::Folder *History::folder() const {
-	return _folder;
+	return _folder.value_or(nullptr);
 }
 
 void History::setFolder(
@@ -1824,36 +1831,41 @@ void History::clearFolder() {
 }
 
 void History::setFolderPointer(Data::Folder *folder) {
+	using Mode = Dialogs::Mode;
+
 	if (_folder == folder) {
 		return;
 	}
-	using Mode = Dialogs::Mode;
-	const auto wasAll = inChatList(Mode::All);
-	const auto wasImportant = wasAll && inChatList(Mode::Important);
-	if (wasAll) {
+	const auto wasKnown = folderKnown();
+	const auto wasInAll = inChatList(Mode::All);
+	const auto wasInImportant = wasInAll && inChatList(Mode::Important);
+	if (wasInAll) {
 		removeFromChatList(Mode::All);
-		if (wasImportant) {
+		if (wasInImportant) {
 			removeFromChatList(Mode::Important);
 		}
 	}
-	const auto was = std::exchange(_folder, folder);
+	const auto was = _folder.value_or(nullptr);
+	_folder = folder;
 	if (was) {
 		was->unregisterOne(this);
 	}
-	if (wasAll) {
+	if (wasInAll) {
 		addToChatList(Mode::All);
-		if (wasImportant) {
+		if (wasInImportant) {
 			addToChatList(Mode::Important);
 		}
 		owner().chatsListChanged(was);
-		owner().chatsListChanged(_folder);
+		owner().chatsListChanged(folder);
+	} else if (!wasKnown) {
+		updateChatListSortPosition();
 	}
-	if (_folder) {
-		_folder->registerOne(this);
+	if (folder) {
+		folder->registerOne(this);
 	}
 }
 
-TimeId History::adjustChatListTimeId() const {
+TimeId History::adjustedChatListTimeId() const {
 	const auto result = chatListTimeId();
 	if (const auto draft = cloudDraft()) {
 		if (!Data::draftIsNull(draft) && !session().supportMode()) {
@@ -2415,7 +2427,7 @@ bool History::useProxyPromotion() const {
 }
 
 bool History::shouldBeInChatList() const {
-	if (peer->migrateTo() || folder() != nullptr) {
+	if (peer->migrateTo() || !folderKnown()) {
 		return false;
 	} else if (isPinnedDialog()) {
 		return true;

Telegram/SourceFiles/history/history.h

@@ -323,6 +323,7 @@ public:
 
 	std::shared_ptr<AdminLog::LocalIdManager> adminLogIdManager();
 
+	bool folderKnown() const override;
 	Data::Folder *folder() const override;
 	void setFolder(
 		not_null<Data::Folder*> folder,
@@ -416,7 +417,7 @@ private:
 		not_null<Element*> view);
 	void removeNotification(not_null<HistoryItem*> item);
 
-	TimeId adjustChatListTimeId() const override;
+	TimeId adjustedChatListTimeId() const override;
 	void changedInChatListHook(Dialogs::Mode list, bool added) override;
 	void changedChatListPinHook() override;
 
@@ -476,7 +477,7 @@ private:
 	bool _loadedAtTop = false;
 	bool _loadedAtBottom = true;
 
-	Data::Folder *_folder = nullptr;
+	std::optional<Data::Folder*> _folder;
 
 	std::optional<MsgId> _inboxReadBefore;
 	std::optional<MsgId> _outboxReadBefore;