From ff51bf81f30938f118e404adaafed9f94096d09d Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Mon, 20 Jun 2022 11:18:38 +0400
Subject: [PATCH] Allow clearing history in megagroups.

---
 Telegram/SourceFiles/boxes/delete_messages_box.cpp | 2 --
 Telegram/SourceFiles/data/data_histories.cpp       | 3 ++-
 Telegram/SourceFiles/data/data_peer.cpp            | 4 +---
 3 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/Telegram/SourceFiles/boxes/delete_messages_box.cpp b/Telegram/SourceFiles/boxes/delete_messages_box.cpp
index 4b5da52b9..79db2c7ef 100644
--- a/Telegram/SourceFiles/boxes/delete_messages_box.cpp
+++ b/Telegram/SourceFiles/boxes/delete_messages_box.cpp
@@ -337,8 +337,6 @@ auto DeleteMessagesBox::revokeText(not_null<PeerData*> peer) const
 				lt_user,
 				{ user->firstName },
 				Ui::Text::RichLangValue);
-		} else if (_wipeHistoryJustClear) {
-			return std::nullopt;
 		} else {
 			result.checkbox.text = tr::lng_delete_for_everyone_check(tr::now);
 		}
diff --git a/Telegram/SourceFiles/data/data_histories.cpp b/Telegram/SourceFiles/data/data_histories.cpp
index bb700b233..60e7127ea 100644
--- a/Telegram/SourceFiles/data/data_histories.cpp
+++ b/Telegram/SourceFiles/data/data_histories.cpp
@@ -641,8 +641,9 @@ void Histories::deleteAllMessages(
 			//	}
 			}).send();
 		} else if (channel) {
+			using Flag = MTPchannels_DeleteHistory::Flag;
 			return session().api().request(MTPchannels_DeleteHistory(
-				MTP_flags(0),
+				MTP_flags(revoke ? Flag::f_for_everyone : Flag(0)),
 				channel->inputChannel,
 				MTP_int(deleteTillId)
 			)).done(finish).fail(finish).send();
diff --git a/Telegram/SourceFiles/data/data_peer.cpp b/Telegram/SourceFiles/data/data_peer.cpp
index 01fe66a84..9422f711d 100644
--- a/Telegram/SourceFiles/data/data_peer.cpp
+++ b/Telegram/SourceFiles/data/data_peer.cpp
@@ -903,9 +903,7 @@ bool PeerData::canRevokeFullHistory() const {
 	} else if (const auto chat = asChat()) {
 		return chat->amCreator();
 	} else if (const auto megagroup = asMegagroup()) {
-		return megagroup->amCreator()
-			&& megagroup->membersCountKnown()
-			&& megagroup->canDelete();
+		return megagroup->amCreator();
 	}
 	return false;
 }