Optimize confcall join process.

Telegram/SourceFiles/calls/group/calls_group_call.cpp

@@ -1554,6 +1554,11 @@ void GroupCall::rejoin(not_null<PeerData*> as) {
 				).arg(_joinState.payload.ssrc));
 			if (!_conferenceCall && _migratedConferenceInfo) {
 				startConference();
+			} else if (_conferenceCall
+				&& !_conferenceCall->blockchainMayBeEmpty()
+				&& !_e2e->hasLastBlock0()) {
+				//sendJoinRequest(); AssertIsDebug();
+				refreshLastBlockAndJoin();
 			} else {
 				sendJoinRequest();
 			}

Telegram/SourceFiles/data/data_group_call.cpp

@@ -135,6 +135,10 @@ bool GroupCall::listenersHidden() const {
 	return _listenersHidden;
 }
 
+bool GroupCall::blockchainMayBeEmpty() const {
+	return _version < 2;
+}
+
 not_null<PeerData*> GroupCall::peer() const {
 	return _peer;
 }

Telegram/SourceFiles/data/data_group_call.h

@@ -78,6 +78,7 @@ public:
 	[[nodiscard]] bool rtmp() const;
 	[[nodiscard]] bool canManage() const;
 	[[nodiscard]] bool listenersHidden() const;
+	[[nodiscard]] bool blockchainMayBeEmpty() const;
 	[[nodiscard]] not_null<PeerData*> peer() const;
 	[[nodiscard]] MTPInputGroupCall input() const;
 	[[nodiscard]] QString title() const {

Telegram/SourceFiles/tde2e/tde2e_api.cpp

@@ -102,6 +102,10 @@ PublicKey Call::myKey() const {
 	return _myKey;
 }
 
+bool Call::hasLastBlock0() const {
+	return _lastBlock0.has_value();
+}
+
 void Call::refreshLastBlock0(std::optional<Block> block) {
 	_lastBlock0 = std::move(block);
 }

Telegram/SourceFiles/tde2e/tde2e_api.h

@@ -95,6 +95,7 @@ public:
 	[[nodiscard]] QByteArray emojiHash() const;
 	[[nodiscard]] rpl::producer<QByteArray> emojiHashValue() const;
 
+	[[nodiscard]] bool hasLastBlock0() const;
 	void refreshLastBlock0(std::optional<Block> block);
 	[[nodiscard]] Block makeJoinBlock();
 	[[nodiscard]] Block makeRemoveBlock(const base::flat_set<UserId> &ids);