Preserve topicRootId() on edition-to-history-clear.

Author: john-preston

Telegram/SourceFiles/history/history_item.cpp

@@ -839,6 +839,8 @@ bool HistoryItem::awaitingVideoProcessing() const {
 HistoryServiceDependentData *HistoryItem::GetServiceDependentData() {
 	if (const auto pinned = Get<HistoryServicePinned>()) {
 		return pinned;
+	} else if (const auto clear = Get<HistoryServiceClearHistory>()) {
+		return clear;
 	} else if (const auto gamescore = Get<HistoryServiceGameScore>()) {
 		return gamescore;
 	} else if (const auto payment = Get<HistoryServicePayment>()) {
@@ -2357,14 +2359,23 @@ void HistoryItem::updateForwardedInfo(const MTPMessageFwdHeader *fwd) {
 }
 
 void HistoryItem::applyEditionToHistoryCleared() {
+	const auto rootId = topicRootId();
+	const auto topicPost = (rootId != Data::ForumTopic::kGeneralId);
+	auto action = Api::SendAction(history());
+	action.replyTo = FullReplyTo{
+		.messageId = FullMsgId(_history->peer->id, topicPost ? rootId : 0),
+		.topicRootId = rootId,
+	};
+	using Flag = MTPDmessageService::Flag;
 	applyEdition(
 		MTP_messageService(
-			MTP_flags(0),
+			MTP_flags(Flag()
+				| (topicPost ? Flag::f_reply_to : Flag())),
 			MTP_int(id),
 			peerToMTP(PeerId(0)), // from_id
 			peerToMTP(_history->peer->id),
 			MTPPeer(), // saved_peer_id
-			MTPMessageReplyHeader(),
+			NewMessageReplyHeader(action),
 			MTP_int(date()),
 			MTP_messageActionHistoryClear(),
 			MTPMessageReactions(),
@@ -4738,6 +4749,8 @@ void HistoryItem::createServiceFromMtp(const MTPDmessageService &message) {
 	const auto type = action.type();
 	if (type == mtpc_messageActionPinMessage) {
 		UpdateComponents(HistoryServicePinned::Bit());
+	} else if (type == mtpc_messageActionHistoryClear) {
+		UpdateComponents(HistoryServiceClearHistory::Bit());
 	} else if (type == mtpc_messageActionTopicCreate
 		|| type == mtpc_messageActionTopicEdit) {
 		UpdateComponents(HistoryServiceTopicInfo::Bit());

Telegram/SourceFiles/history/history_item_components.h

@@ -673,6 +673,11 @@ struct HistoryServicePinned
 , HistoryServiceDependentData {
 };
 
+struct HistoryServiceClearHistory
+: RuntimeComponent<HistoryServiceClearHistory, HistoryItem>
+, HistoryServiceDependentData {
+};
+
 struct HistoryServiceTopicInfo
 : RuntimeComponent<HistoryServiceTopicInfo, HistoryItem>
 , HistoryServiceDependentData {

Telegram/SourceFiles/history/history_item_helpers.cpp

@@ -887,6 +887,8 @@ MTPMessageReplyHeader NewMessageReplyHeader(const Api::SendAction &action) {
 			? PeerId()
 			: replyTo.messageId.peer;
 		const auto replyToTop = LookupReplyToTop(action.history, replyTo);
+		const auto topicPost = replyTo.topicRootId
+			&& (replyTo.topicRootId != Data::ForumTopic::kGeneralId);
 		auto quoteEntities = Api::EntitiesToMTP(
 			&action.history->session(),
 			replyTo.quote.entities,
@@ -903,7 +905,8 @@ MTPMessageReplyHeader NewMessageReplyHeader(const Api::SendAction &action) {
 				| (quoteEntities.v.empty()
 					? Flag()
 					: Flag::f_quote_entities)
-				| (replyTo.todoItemId ? Flag::f_todo_item_id : Flag())),
+				| (replyTo.todoItemId ? Flag::f_todo_item_id : Flag())
+				| (topicPost ? Flag::f_forum_topic : Flag())),
 			MTP_int(replyTo.messageId.msg),
 			peerToMTP(externalPeerId),
 			MTPMessageFwdHeader(), // reply_from