Add ability to archive/unarchive the chats.

Telegram/SourceFiles/window/main_window.cpp

@@ -620,6 +620,9 @@ void MainWindow::setInactivePress(bool inactive) {
 	}
 }
 
-MainWindow::~MainWindow() = default;
+MainWindow::~MainWindow() {
+	// We want to delete all widgets before the _controller.
+	_body.destroy();
+}
 
 } // namespace Window