Check support mode on full self load.

Telegram/SourceFiles/storage/storage_account.cpp

@@ -2025,6 +2025,10 @@ void Account::readStickerSets(
 		Data::StickersSetFlags readingFlags) {
 	using SetFlag = Data::StickersSetFlag;
 
+	if (!stickersKey) {
+		return;
+	}
+
 	FileReadDescriptor stickers;
 	if (!ReadEncryptedFile(stickers, stickersKey, _basePath, _localKey)) {
 		ClearKey(stickersKey, _basePath);
@@ -2948,12 +2952,16 @@ void Account::writeExportSettings(const Export::Settings &settings) {
 }
 
 Export::Settings Account::readExportSettings() {
+	if (!_exportSettingsKey) {
+		return {};
+	}
+
 	FileReadDescriptor file;
 	if (!ReadEncryptedFile(file, _exportSettingsKey, _basePath, _localKey)) {
 		ClearKey(_exportSettingsKey, _basePath);
 		_exportSettingsKey = 0;
 		writeMapDelayed();
-		return Export::Settings();
+		return {};
 	}
 
 	quint32 types = 0, fullChats = 0;

Telegram/SourceFiles/support/support_helper.cpp

@@ -17,12 +17,13 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "api/api_text_entities.h"
 #include "history/history.h"
 #include "boxes/abstract_box.h"
-#include "ui/toast/toast.h"
-#include "ui/widgets/fields/input_field.h"
+#include "ui/boxes/confirm_box.h"
 #include "ui/chat/attach/attach_prepare.h"
 #include "ui/text/format_values.h"
 #include "ui/text/text_entity.h"
 #include "ui/text/text_options.h"
+#include "ui/toast/toast.h"
+#include "ui/widgets/fields/input_field.h"
 #include "chat_helpers/message_field.h"
 #include "chat_helpers/emoji_suggestions_widget.h"
 #include "base/unixtime.h"
@@ -292,8 +293,32 @@ Helper::Helper(not_null<Main::Session*> session)
 
 std::unique_ptr<Helper> Helper::Create(not_null<Main::Session*> session) {
 	//return std::make_unique<Helper>(session); AssertIsDebug();
-	const auto valid = session->user()->phone().startsWith(u"424"_q);
-	return valid ? std::make_unique<Helper>(session) : nullptr;
+	return ShouldUse(session) ? std::make_unique<Helper>(session) : nullptr;
+}
+
+void Helper::CheckIfLost(not_null<Window::SessionController*> controller) {
+	static auto Checked = false;
+	if (Checked) {
+		return;
+	}
+	Checked = true;
+
+	const auto session = &controller->session();
+	if (!ShouldUse(session) || session->supportMode()) {
+		return;
+	}
+	session->local().writeSelf();
+	controller->show(Ui::MakeConfirmBox({
+		.text = u"This account should have support mode, "
+			"but it seems it was lost. Restart?"_q,
+		.confirmed = [=] { Core::Restart(); },
+		.confirmText = u"Restart"_q,
+		.title = u"Support Mode Lost"_q,
+	}));
+}
+
+bool Helper::ShouldUse(not_null<Main::Session*> session) {
+	return session->user()->phone().startsWith(u"424"_q);
 }
 
 void Helper::registerWindow(not_null<Window::SessionController*> controller) {

Telegram/SourceFiles/support/support_helper.h

@@ -44,6 +44,7 @@ public:
 	explicit Helper(not_null<Main::Session*> session);
 
 	static std::unique_ptr<Helper> Create(not_null<Main::Session*> session);
+	static void CheckIfLost(not_null<Window::SessionController*> controller);
 
 	void registerWindow(not_null<Window::SessionController*> controller);
 	void cloudDraftChanged(not_null<History*> history);
@@ -92,6 +93,8 @@ private:
 		TextWithEntities text,
 		Fn<void(bool success)> done);
 
+	static bool ShouldUse(not_null<Main::Session*> session);
+
 	const not_null<Main::Session*> _session;
 	MTP::Sender _api;
 	Templates _templates;

Telegram/SourceFiles/window/window_session_controller.cpp

@@ -1573,6 +1573,9 @@ SessionController::SessionController(
 			}
 		}
 		if (update.flags & Data::PeerUpdate::Flag::FullInfo) {
+			if (update.peer->isSelf()) {
+				Support::Helper::CheckIfLost(this);
+			}
 			fullInfoLoadedHook(update.peer);
 		}
 		return (update.flags & Data::PeerUpdate::Flag::FullInfo)