Moved out dock menu from obj-c implementation to Qt implementation.

This allows to remove
the `NSApplicationDelegate::applicationDockMenu` patch for Qt.

Telegram/SourceFiles/menu/menu_dock.cpp

@@ -0,0 +1,83 @@
+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#include "menu/menu_dock.h"
+
+#include "core/application.h"
+#include "core/core_settings.h"
+#include "data/data_user.h"
+#include "lang/lang_keys.h"
+#include "main/main_account.h"
+#include "main/main_domain.h"
+#include "main/main_session.h"
+#include "media/audio/media_audio.h"
+#include "media/player/media_player_instance.h"
+#include "ui/text/text_utilities.h"
+
+#include <QtWidgets/QMenu>
+
+namespace Menu {
+
+void RefreshDockMenu(QMenu *menu) {
+	menu->clear();
+	if (!Core::IsAppLaunched()) {
+		return;
+	}
+
+	const auto accounts = Core::App().domain().orderedAccounts();
+	if (accounts.size() > 1) {
+		menu->addSeparator();
+		const auto profilesHeader = menu->addAction(
+			tr::lng_mac_menu_profiles(tr::now));
+		profilesHeader->setEnabled(false);
+		constexpr auto kMaxLength = 30;
+		for (const auto &account : accounts) {
+			if (account->sessionExists()) {
+				const auto name = account->session().user()->name();
+				menu->addAction(
+					(name.size() > kMaxLength)
+						? (name.mid(0, kMaxLength) + Ui::kQEllipsis)
+						: name,
+					[account] {
+						Core::App().ensureSeparateWindowFor(account);
+					});
+			}
+		}
+		menu->addSeparator();
+	}
+
+	menu->addAction(
+		Core::App().settings().desktopNotify()
+			? tr::lng_disable_notifications_from_tray(tr::now)
+			: tr::lng_enable_notifications_from_tray(tr::now),
+		[] {
+			auto &settings = Core::App().settings();
+			settings.setDesktopNotify(!settings.desktopNotify());
+		});
+
+	using namespace Media::Player;
+	const auto type = instance()->getActiveType();
+	const auto state = instance()->getState(type);
+	if (!IsStoppedOrStopping(state.state)) {
+		menu->addSeparator();
+		const auto previous = menu->addAction(
+			tr::lng_mac_menu_player_previous(tr::now),
+			[] { instance()->previous(); });
+		previous->setEnabled(instance()->previousAvailable(type));
+		menu->addAction(
+			IsPausedOrPausing(state.state)
+				? tr::lng_mac_menu_player_resume(tr::now)
+				: tr::lng_mac_menu_player_pause(tr::now),
+			[] { instance()->playPause(); });
+		const auto next = menu->addAction(
+			tr::lng_mac_menu_player_next(tr::now),
+			[] { instance()->next(); });
+		next->setEnabled(instance()->nextAvailable(type));
+	}
+}
+
+} // namespace Menu