Move Settings::Advanced class to anonymous namespace

- Move Advanced class definition into .cpp file anonymous namespace
- Export only Type AdvancedId() in header
- Keep exported helper functions (SetupConnectionType, HasUpdate, etc.)
- Remove unused SetupWindowCloseBehaviorContent declaration
- Update callers to use AdvancedId() instead of Advanced::Id()

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Telegram/SourceFiles/core/update_checker.cpp

@@ -1658,7 +1658,7 @@ void UpdateApplication() {
 				controller->showSection(
 					std::make_shared<Info::Memento>(
 						Info::Settings::Tag{ controller->session().user() },
-						::Settings::Advanced::Id()),
+						::Settings::AdvancedId()),
 					Window::SectionShow());
 			} else {
 				window->widget()->showSpecialLayer(

Telegram/SourceFiles/settings/sections/settings_advanced.cpp

@@ -7,6 +7,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #include "settings/sections/settings_advanced.h"
 
+#include "settings/settings_common_session.h"
+
 #include "api/api_global_privacy.h"
 #include "apiwrap.h"
 #include "base/call_delayed.h"
@@ -1112,6 +1114,19 @@ void BuildExportSection(SectionBuilder &builder) {
 	});
 }
 
+class Advanced : public Section<Advanced> {
+public:
+	Advanced(
+		QWidget *parent,
+		not_null<Window::SessionController*> controller);
+
+	[[nodiscard]] rpl::producer<QString> title() override;
+
+private:
+	void setupContent();
+
+};
+
 const auto kMeta = BuildHelper({
 	.id = Advanced::Id(),
 	.parentId = MainId(),
@@ -1135,6 +1150,27 @@ const auto kMeta = BuildHelper({
 	BuildExportSection(builder);
 });
 
+const SectionBuildMethod kAdvancedSection = kMeta.build;
+
+Advanced::Advanced(
+	QWidget *parent,
+	not_null<Window::SessionController*> controller)
+: Section(parent, controller) {
+	setupContent();
+}
+
+rpl::producer<QString> Advanced::title() {
+	return tr::lng_settings_advanced();
+}
+
+void Advanced::setupContent() {
+	const auto content = Ui::CreateChild<Ui::VerticalLayout>(this);
+
+	build(content, kAdvancedSection);
+
+	Ui::ResizeFitChild(this, content);
+}
+
 } // namespace
 
 void SetupConnectionType(
@@ -1771,28 +1807,8 @@ void PreloadArchiveSettings(not_null<::Main::Session*> session) {
 	session->api().globalPrivacy().reload();
 }
 
-Advanced::Advanced(
-	QWidget *parent,
-	not_null<Window::SessionController*> controller)
-: Section(parent, controller) {
-	setupContent();
+Type AdvancedId() {
+	return Advanced::Id();
 }
 
-rpl::producer<QString> Advanced::title() {
-	return tr::lng_settings_advanced();
-}
-
-void Advanced::setupContent() {
-	const auto content = Ui::CreateChild<Ui::VerticalLayout>(this);
-
-	build(content, Builder::AdvancedSection);
-
-	Ui::ResizeFitChild(this, content);
-}
-
-namespace Builder {
-
-SectionBuildMethod AdvancedSection = kMeta.build;
-
-} // namespace Builder
 } // namespace Settings

Telegram/SourceFiles/settings/sections/settings_advanced.h

@@ -7,7 +7,6 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #pragma once
 
-#include "settings/settings_common_session.h"
 #include "settings/settings_type.h"
 
 namespace Main {
@@ -27,6 +26,8 @@ class SessionController;
 
 namespace Settings {
 
+[[nodiscard]] Type AdvancedId();
+
 void SetupConnectionType(
 	not_null<Window::Controller*> controller,
 	not_null<::Main::Account*> account,
@@ -36,9 +37,6 @@ void SetupUpdate(not_null<Ui::VerticalLayout*> container);
 void SetupWindowTitleContent(
 	Window::SessionController *controller,
 	not_null<Ui::VerticalLayout*> container);
-void SetupWindowCloseBehaviorContent(
-	Window::SessionController *controller,
-	not_null<Ui::VerticalLayout*> container);
 void SetupSystemIntegrationContent(
 	Window::SessionController *controller,
 	not_null<Ui::VerticalLayout*> container);
@@ -51,22 +49,4 @@ void ArchiveSettingsBox(
 	not_null<Window::SessionController*> controller);
 void PreloadArchiveSettings(not_null<::Main::Session*> session);
 
-class Advanced : public Section<Advanced> {
-public:
-	Advanced(
-		QWidget *parent,
-		not_null<Window::SessionController*> controller);
-
-	[[nodiscard]] rpl::producer<QString> title() override;
-
-private:
-	void setupContent();
-
-};
-
-namespace Builder {
-
-extern SectionBuildMethod AdvancedSection;
-
-} // namespace Builder
 } // namespace Settings

Telegram/SourceFiles/settings/sections/settings_main.cpp

@@ -400,7 +400,7 @@ void BuildSectionButtons(SectionBuilder &builder) {
 	builder.addSectionButton({
 		.id = u"main/advanced"_q,
 		.title = tr::lng_settings_advanced(),
-		.targetSection = Advanced::Id(),
+		.targetSection = AdvancedId(),
 		.icon = { &st::menuIconManage },
 		.keywords = { u"performance"_q, u"proxy"_q, u"experimental"_q },
 	});