Fix unpinning all messages.

Telegram/SourceFiles/history/history.cpp

@@ -441,6 +441,19 @@ void History::destroyMessage(not_null<HistoryItem*> item) {
 	}
 }
 
+void History::unpinAllMessages() {
+	session().storage().remove(
+		Storage::SharedMediaRemoveAll(
+			peer->id,
+			Storage::SharedMediaType::Pinned));
+	peer->setHasPinnedMessages(false);
+	for (const auto &message : _messages) {
+		if (message->isPinned()) {
+			message->setIsPinned(false);
+		}
+	}
+}
+
 not_null<HistoryItem*> History::addNewItem(
 		not_null<HistoryItem*> item,
 		bool unread) {

Telegram/SourceFiles/history/history.h

@@ -113,6 +113,8 @@ public:
 	}
 	void destroyMessage(not_null<HistoryItem*> item);
 
+	void unpinAllMessages();
+
 	HistoryItem *addNewMessage(
 		const MTPMessage &msg,
 		MTPDmessage_ClientFlags clientFlags,

Telegram/SourceFiles/window/window_peer_menu.cpp

@@ -1182,20 +1182,16 @@ void UnpinAllMessages(
 	Ui::show(Box<ConfirmBox>(tr::lng_pinned_unpin_all_sure(tr::now), tr::lng_pinned_unpin(tr::now), crl::guard(navigation, [=] {
 		Ui::hideLayer();
 		const auto api = &history->session().api();
-		const auto peer = history->peer;
 		const auto sendRequest = [=](auto self) -> void {
 			api->request(MTPmessages_UnpinAllMessages(
-				peer->input
+				history->peer->input
 			)).done([=](const MTPmessages_AffectedHistory &result) {
+				const auto peer = history->peer;
 				const auto offset = api->applyAffectedHistory(peer, result);
 				if (offset > 0) {
 					self(self);
 				} else {
-					peer->session().storage().remove(
+					history->unpinAllMessages();
-						Storage::SharedMediaRemoveAll(
-							peer->id,
-							Storage::SharedMediaType::Pinned));
-					peer->setHasPinnedMessages(false);
 				}
 			}).send();
 		};