Add warning for unsaved Bio section closing.

Telegram/Resources/langs/lang.strings

@@ -349,6 +349,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_settings_username_label" = "Username";
 "lng_settings_phone_label" = "Phone number";
 "lng_settings_username_add" = "Add username";
+"lng_settings_close_sure" = "Are you sure you want to close this page? You didn't save your changes.";
 
 "lng_backgrounds_header" = "Choose your new chat background";
 "lng_theme_sure_keep" = "Keep this theme?";

Telegram/SourceFiles/info/info_controller.cpp

@@ -277,6 +277,10 @@ rpl::producer<bool> Controller::canSaveChanges() const {
 	return _canSaveChanges.value();
 }
 
+bool Controller::canSaveChangesNow() const {
+	return _canSaveChanges.current();
+}
+
 Controller::~Controller() = default;
 
 } // namespace Info

Telegram/SourceFiles/info/info_controller.h

@@ -190,6 +190,7 @@ public:
 
 	void setCanSaveChanges(rpl::producer<bool> can);
 	rpl::producer<bool> canSaveChanges() const;
+	bool canSaveChangesNow() const;
 
 	void saveSearchState(not_null<ContentMemento*> memento);
 

Telegram/SourceFiles/info/info_wrap_widget.cpp

@@ -25,6 +25,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "window/window_slide_animation.h"
 #include "window/window_peer_menu.h"
 #include "boxes/peer_list_box.h"
+#include "boxes/confirm_box.h"
 #include "auth_session.h"
 #include "data/data_session.h"
 #include "mainwidget.h"
@@ -350,8 +351,8 @@ void WrapWidget::createTopBar() {
 	if (wrapValue == Wrap::Narrow || hasStackHistory()) {
 		_topBar->enableBackButton();
 		_topBar->backRequest(
-		) | rpl::start_with_next([this] {
+		) | rpl::start_with_next([=] {
-			_controller->showBackFromStack();
+			checkBeforeClose([=] { _controller->showBackFromStack(); });
 		}, _topBar->lifetime());
 	} else if (wrapValue == Wrap::Side) {
 		auto close = _topBar->addButton(
@@ -368,7 +369,9 @@ void WrapWidget::createTopBar() {
 				_topBar,
 				st::infoLayerTopBarClose));
 		close->addClickHandler([this] {
-			_controller->parentController()->hideSpecialLayer();
+			checkBeforeClose([=] {
+				_controller->parentController()->hideSpecialLayer();
+			});
 		});
 	} else if (requireTopBarSearch()) {
 		auto search = _controller->searchFieldController();
@@ -398,6 +401,22 @@ void WrapWidget::createTopBar() {
 	_topBar->show();
 }
 
+void WrapWidget::checkBeforeClose(Fn<void()> close) {
+	const auto confirmed = [=] {
+		const auto copy = close;
+		Ui::hideLayer();
+		copy();
+	};
+	if (_controller->canSaveChangesNow()) {
+		Ui::show(Box<ConfirmBox>(
+			lang(lng_settings_close_sure),
+			lang(lng_close),
+			confirmed));
+	} else {
+		confirmed();
+	}
+}
+
 void WrapWidget::addTopBarMenuButton() {
 	Expects(_topBar != nullptr);
 
@@ -950,7 +969,7 @@ void WrapWidget::resizeEvent(QResizeEvent *e) {
 void WrapWidget::keyPressEvent(QKeyEvent *e) {
 	if (e->key() == Qt::Key_Escape) {
 		if (hasStackHistory() || wrap() != Wrap::Layer) {
-			_controller->showBackFromStack();
+			checkBeforeClose([=] { _controller->showBackFromStack(); });
 			return;
 		}
 	}

Telegram/SourceFiles/info/info_wrap_widget.h

@@ -150,6 +150,7 @@ private:
 	void injectActiveFeedProfile(not_null<Data::Feed*> feed);
 	void injectActiveProfileMemento(
 		std::unique_ptr<ContentMemento> memento);
+	void checkBeforeClose(Fn<void()> close);
 	void restoreHistoryStack(
 		std::vector<std::unique_ptr<ContentMemento>> stack);
 	bool hasStackHistory() const {