Allow opening new account in a separate window.

Telegram/SourceFiles/main/main_domain.cpp

@@ -305,14 +305,24 @@ not_null<Main::Account*> Domain::add(MTP::Environment environment) {
 	return account;
 }
 
-void Domain::addActivated(MTP::Environment environment) {
+void Domain::addActivated(MTP::Environment environment, bool newWindow) {
+	const auto added = [&](not_null<Main::Account*> account) {
+		if (newWindow) {
+			Core::App().ensureSeparateWindowForAccount(account);
+		} else if (const auto window = Core::App().separateWindowForAccount(
+				account)) {
+			window->activate();
+		} else {
+			activate(account);
+		}
+	};
 	if (accounts().size() < maxAccounts()) {
-		activate(add(environment));
+		added(add(environment));
 	} else {
 		for (auto &[index, account] : accounts()) {
 			if (!account->sessionExists()
 				&& account->mtp().environment() == environment) {
-				activate(account.get());
+				added(account.get());
 				break;
 			}
 		}

Telegram/SourceFiles/main/main_domain.h

@@ -70,7 +70,7 @@ public:
 	[[nodiscard]] not_null<Main::Account*> add(MTP::Environment environment);
 	void maybeActivate(not_null<Main::Account*> account);
 	void activate(not_null<Main::Account*> account);
-	void addActivated(MTP::Environment environment);
+	void addActivated(MTP::Environment environment, bool newWindow = false);
 
 	// Interface for Storage::Domain.
 	void accountAddedInStorage(AccountWithIndex accountWithIndex);

Telegram/SourceFiles/mainwidget.cpp

@@ -1294,7 +1294,7 @@ bool MainWidget::showHistoryInDifferentWindow(
 	return true;
 }
 
-void MainWidget::showPeerHistory(
+void MainWidget::showHistory(
 		PeerId peerId,
 		const SectionShow &params,
 		MsgId showAtMsgId) {
@@ -1311,6 +1311,7 @@ void MainWidget::showPeerHistory(
 			Assert(isPrimary());
 			if (params.activation != anim::activation::background) {
 				_controller->show(Ui::MakeInformBox(unavailable));
+				_controller->window().activate();
 			}
 			return;
 		}
@@ -1324,9 +1325,13 @@ void MainWidget::showPeerHistory(
 		return;
 	}
 
+	if (peerId && params.activation != anim::activation::background) {
+		_controller->window().activate();
+	}
+
 	if (!(_history->peer() && _history->peer()->id == peerId)
 		&& preventsCloseSection(
-			[=] { showPeerHistory(peerId, params, showAtMsgId); },
+			[=] { showHistory(peerId, params, showAtMsgId); },
 			params)) {
 		return;
 	}
@@ -1490,7 +1495,7 @@ void MainWidget::showMessage(
 				return;
 			}
 		} else if (_history->peer() == item->history()->peer) {
-			showPeerHistory(peerId, params, itemId);
+			showHistory(peerId, params, itemId);
 			return;
 		}
 	}

Telegram/SourceFiles/mainwidget.h

@@ -220,7 +220,7 @@ public:
 
 	void toggleChooseChatTheme(not_null<PeerData*> peer);
 
-	void showPeerHistory(
+	void showHistory(
 		PeerId peer,
 		const SectionShow &params,
 		MsgId msgId);

Telegram/SourceFiles/settings/settings_information.cpp

@@ -778,23 +778,38 @@ not_null<Ui::SlideWrap<Ui::SettingsButton>*> AccountsList::setupAdd() {
 				})))->setDuration(0);
 	const auto button = result->entity();
 
-	const auto add = [=](MTP::Environment environment) {
-		Core::App().preventOrInvoke([=] {
-			auto &domain = _controller->session().domain();
-			if (domain.accounts().size() >= domain.maxAccounts()) {
-				_controller->show(
-					Box(AccountsLimitBox, &_controller->session()));
-			} else {
-				domain.addActivated(environment);
+	using Environment = MTP::Environment;
+	const auto add = [=](Environment environment, bool newWindow = false) {
+		auto &domain = _controller->session().domain();
+		auto found = false;
+		for (const auto &[index, account] : domain.accounts()) {
+			const auto raw = account.get();
+			if (!raw->sessionExists()
+				&& raw->mtp().environment() == environment) {
+				found = true;
 			}
-		});
+		}
+		if (!found && domain.accounts().size() >= domain.maxAccounts()) {
+			_controller->show(
+				Box(AccountsLimitBox, &_controller->session()));
+		} else if (newWindow) {
+			domain.addActivated(environment, true);
+		} else {
+			_controller->window().preventOrInvoke([=] {
+				_controller->session().domain().addActivated(environment);
+			});
+		}
 	};
 
 	button->setAcceptBoth(true);
 	button->clicks(
 	) | rpl::start_with_next([=](Qt::MouseButton which) {
 		if (which == Qt::LeftButton) {
-			add(MTP::Environment::Production);
+			const auto modifiers = button->clickModifiers();
+			const auto newWindow = (modifiers & Qt::ControlModifier)
+				&& base::options::lookup<bool>(
+					Dialogs::kOptionCtrlClickChatNewWindow).value();
+			add(Environment::Production, newWindow);
 			return;
 		} else if (which != Qt::RightButton
 			|| !IsAltShift(button->clickModifiers())) {
@@ -802,10 +817,10 @@ not_null<Ui::SlideWrap<Ui::SettingsButton>*> AccountsList::setupAdd() {
 		}
 		_contextMenu = base::make_unique_q<Ui::PopupMenu>(_outer);
 		_contextMenu->addAction("Production Server", [=] {
-			add(MTP::Environment::Production);
+			add(Environment::Production);
 		});
 		_contextMenu->addAction("Test Server", [=] {
-			add(MTP::Environment::Test);
+			add(Environment::Test);
 		});
 		_contextMenu->popup(QCursor::pos());
 	}, button->lifetime());

Telegram/SourceFiles/window/window_session_controller.cpp

@@ -1689,10 +1689,7 @@ void SessionController::showPeerHistory(
 		PeerId peerId,
 		const SectionShow &params,
 		MsgId msgId) {
-	content()->showPeerHistory(peerId, params, msgId);
-	if (peerId && params.activation != anim::activation::background) {
-		_window->activate();
-	}
+	content()->showHistory(peerId, params, msgId);
 }
 
 void SessionController::showMessage(