[Improvement] Allow to view currently used usernames

Telegram/SourceFiles/settings/settings_codes.cpp

@@ -18,6 +18,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "main/main_account.h"
 #include "main/main_domain.h"
 #include "ui/boxes/confirm_box.h"
+#include "boxes/add_contact_box.h"
 #include "lang/lang_cloud_manager.h"
 #include "lang/lang_instance.h"
 #include "core/application.h"
@@ -273,6 +274,13 @@ auto GenerateCodes() {
 		Data::CloudThemes::SetTestingColors(now);
 		Ui::Toast::Show(now ? "Testing chat theme colors!" : "Not testing..");
 	});
+	codes.emplace(qsl("usernames"), [](SessionController *window) {
+		Ui::show(
+			Box<RevokePublicLinkBox>(
+				&window->session(),
+				Fn<void()>()),
+			Ui::LayerOption::KeepOther);
+	});
 	codes.emplace(qsl("reloadlang"), [](SessionController *window) {
 		Kotato::Lang::Load(
 			Lang::GetInstance().baseId(),