Leave unread chats in filter until closed.

Telegram/SourceFiles/data/data_chat_filters.cpp

@@ -199,7 +199,8 @@ bool ChatFilter::contains(not_null<History*> history) const {
 			&& (!(_flags & Flag::NoRead)
 				|| history->unreadCount()
 				|| history->unreadMark()
-				|| history->hasUnreadMentions())
+				|| history->hasUnreadMentions()
+				|| history->fakeUnreadWhileOpened())
 			&& (!(_flags & Flag::NoArchived)
 				|| (history->folderKnown() && !history->folder())))
 		|| _always.contains(history);

Telegram/SourceFiles/history/history.cpp

@@ -1837,6 +1837,23 @@ bool History::unreadMark() const {
 	return _unreadMark;
 }
 
+void History::setFakeUnreadWhileOpened(bool enabled) {
+	if (_fakeUnreadWhileOpened == enabled
+		|| (enabled
+			&& (!inChatList()
+				|| (!unreadCount()
+					&& !unreadMark()
+					&& !hasUnreadMentions())))) {
+		return;
+	}
+	_fakeUnreadWhileOpened = enabled;
+	owner().chatsFilters().refreshHistory(this);
+}
+
+[[nodiscard]] bool History::fakeUnreadWhileOpened() const {
+	return _fakeUnreadWhileOpened;
+}
+
 bool History::mute() const {
 	return _mute;
 }

Telegram/SourceFiles/history/history.h

@@ -202,6 +202,8 @@ public:
 	void setUnreadCount(int newUnreadCount);
 	void setUnreadMark(bool unread);
 	[[nodiscard]] bool unreadMark() const;
+	void setFakeUnreadWhileOpened(bool enabled);
+	[[nodiscard]] bool fakeUnreadWhileOpened() const;
 	[[nodiscard]] int unreadCountForBadge() const; // unreadCount || unreadMark ? 1 : 0.
 	[[nodiscard]] bool mute() const;
 	bool changeMute(bool newMute);
@@ -540,6 +542,7 @@ private:
 	std::optional<HistoryItem*> _chatListMessage;
 
 	bool _unreadMark = false;
+	bool _fakeUnreadWhileOpened = false;
 
 	// A pointer to the block that is currently being built.
 	// We hold this pointer so we can destroy it while building

Telegram/SourceFiles/history/history_widget.cpp

@@ -1816,6 +1816,7 @@ void HistoryWidget::showHistory(
 			&& (!_history->loadedAtTop() || !_migrated->loadedAtBottom())) {
 			_migrated->clear(History::ClearType::Unload);
 		}
+		_history->setFakeUnreadWhileOpened(true);
 
 		_topBar->setActiveChat(
 			_history,

Telegram/SourceFiles/window/window_session_controller.cpp

@@ -257,7 +257,13 @@ const rpl::variable<Data::Folder*> &SessionController::openedFolder() const {
 }
 
 void SessionController::setActiveChatEntry(Dialogs::RowDescriptor row) {
+	if (const auto history = _activeChatEntry.current().key.history()) {
+		history->setFakeUnreadWhileOpened(false);
+	}
 	_activeChatEntry = row;
+	if (const auto history = row.key.history()) {
+		history->setFakeUnreadWhileOpened(true);
+	}
 	if (session().supportMode()) {
 		pushToChatEntryHistory(row);
 	}