[Improvement] Show linked chat/channel button in profile

Telegram/SourceFiles/info/profile/info_profile_actions.cpp

@@ -656,6 +656,21 @@ object_ptr<Ui::RpWidget> DetailsFiller::setupInfo() {
 		if (!_topic) {
 			addTranslateToMenu(about.text, AboutValue(_peer));
 		}
+
+		if (const auto channel = _peer->asChannel()) {
+			const auto controller = _controller->parentController();
+			auto viewLinkedGroup = [=] {
+				controller->showPeerHistory(
+					channel->linkedChat(),
+					Window::SectionShow::Way::Forward);
+			};
+			AddMainButton(
+				result,
+				(channel->isBroadcast() ? tr::lng_channel_discuss() : tr::lng_manage_linked_channel()),
+				HasLinkedChatValue(channel),
+				std::move(viewLinkedGroup),
+				tracker);
+		}
 	}
 	if (!_peer->isSelf() && !::Kotato::JsonSettings::GetBool("profile_top_mute")) {
 		// No notifications toggle for Self => no separator.

Telegram/SourceFiles/info/profile/info_profile_values.cpp

@@ -377,6 +377,13 @@ rpl::producer<bool> CanAddContactValue(not_null<UserData*> user) {
 	) | rpl::map(!_1);
 }
 
+rpl::producer<bool> HasLinkedChatValue(not_null<ChannelData*> channel) {
+	return channel->session().changes().peerFlagsValue(
+		channel,
+		UpdateFlag::ChannelLinkedChat
+	) | rpl::map([channel] { return channel->linkedChat() != nullptr; });
+}
+
 rpl::producer<bool> AmInChannelValue(not_null<ChannelData*> channel) {
 	return channel->session().changes().peerFlagsValue(
 		channel,

Telegram/SourceFiles/info/profile/info_profile_values.h

@@ -87,6 +87,8 @@ QString IDString(not_null<PeerData*> peer);
 	not_null<UserData*> user);
 [[nodiscard]] rpl::producer<bool> CanAddContactValue(
 	not_null<UserData*> user);
+[[nodiscard]] rpl::producer<bool> HasLinkedChatValue(
+	not_null<ChannelData*> channel);
 [[nodiscard]] rpl::producer<bool> AmInChannelValue(
 	not_null<ChannelData*> channel);
 [[nodiscard]] rpl::producer<int> MembersCountValue(not_null<PeerData*> peer);