Fix app start without data.

Telegram/SourceFiles/main/main_account.cpp

@@ -68,11 +68,7 @@ Storage::Domain &Account::domainLocal() const {
 		const QByteArray &passcode) {
 	Expects(!_appConfig);
 
-	const auto result = _local->legacyStart(passcode);
-	if (result == Storage::StartResult::Success) {
-		start(nullptr);
-	}
-	return result;
+	return _local->legacyStart(passcode);
 }
 
 std::unique_ptr<MTP::Config> Account::prepareToStart(

Telegram/SourceFiles/main/main_domain.cpp

@@ -25,6 +25,10 @@ namespace Main {
 Domain::Domain(const QString &dataName)
 : _dataName(dataName)
 , _local(std::make_unique<Storage::Domain>(this, dataName)) {
+	_active.changes(
+	) | rpl::take(1) | rpl::start_with_next([] {
+		Local::rewriteSettingsIfNeeded();
+	}, _lifetime);
 }
 
 Domain::~Domain() = default;
@@ -39,7 +43,7 @@ Storage::StartResult Domain::start(const QByteArray &passcode) {
 	const auto result = _local->start(passcode);
 	if (result == Storage::StartResult::Success) {
 		activateAfterStarting();
-		Local::rewriteSettingsIfNeeded();
+		crl::on_main(&Core::App(), [=] { suggestExportIfNeeded(); });
 	} else {
 		Assert(!started());
 	}
@@ -52,6 +56,19 @@ void Domain::finish() {
 	base::take(_accounts);
 }
 
+void Domain::suggestExportIfNeeded() {
+	Expects(started());
+
+	for (const auto &[index, account] : _accounts) {
+		if (const auto session = account->maybeSession()) {
+			const auto settings = session->local().readExportSettings();
+			if (const auto availableAt = settings.availableAt) {
+				session->data().suggestStartExport(availableAt);
+			}
+		}
+	}
+}
+
 void Domain::accountAddedInStorage(AccountWithIndex accountWithIndex) {
 	Expects(accountWithIndex.account != nullptr);
 
@@ -95,15 +112,6 @@ void Domain::activateAfterStarting() {
 
 	activate(toActivate);
 	removePasscodeIfEmpty();
-
-	for (const auto &[index, account] : _accounts) {
-		if (const auto session = account->maybeSession()) {
-			const auto settings = session->local().readExportSettings();
-			if (const auto availableAt = settings.availableAt) {
-				session->data().suggestStartExport(availableAt);
-			}
-		}
-	}
 }
 
 const std::vector<Domain::AccountWithIndex> &Domain::accounts() const {

Telegram/SourceFiles/main/main_domain.h

@@ -80,6 +80,7 @@ private:
 	void checkForLastProductionConfig(not_null<Main::Account*> account);
 	void updateUnreadBadge();
 	void scheduleUpdateUnreadBadge();
+	void suggestExportIfNeeded();
 
 	const QString _dataName;
 	const std::unique_ptr<Storage::Domain> _local;

Telegram/SourceFiles/storage/localstorage.cpp

@@ -595,6 +595,8 @@ QString readAutoupdatePrefix() {
 }
 
 void writeBackground(const Data::WallPaper &paper, const QImage &image) {
+	Expects(_settingsWriteAllowed);
+
 	if (!_backgroundCanWrite) {
 		return;
 	}

Telegram/SourceFiles/storage/storage_domain.cpp

@@ -83,6 +83,7 @@ void Domain::startWithSingleAccount(
 	if (auto localKey = account->local().peekLegacyLocalKey()) {
 		_localKey = std::move(localKey);
 		encryptLocalKey(passcode);
+		account->start(nullptr);
 	} else {
 		generateLocalKey();
 		account->start(account->prepareToStart(_localKey));