Fix event loop for non-first instance on Linux

Telegram/SourceFiles/platform/linux/specific_linux.cpp

@@ -245,6 +245,22 @@ void LaunchGApplication() {
 			.chopped(8)
 			.toStdString();
 
+		const auto owned = [&] {
+			if (!Gio::Application::id_is_valid(appId)) {
+				return false;
+			}
+
+			try {
+				return base::Platform::DBus::NameHasOwner(
+					Gio::DBus::Connection::get_sync(
+						Gio::DBus::BusType::SESSION),
+					appId);
+			} catch (...) {
+			}
+
+			return false;
+		}();
+
 		const auto app = Glib::wrap(
 			G_APPLICATION(
 				g_object_new(
@@ -254,7 +270,8 @@ void LaunchGApplication() {
 						? appId.c_str()
 						: nullptr,
 					"flags",
-					G_APPLICATION_HANDLES_OPEN,
+					G_APPLICATION_HANDLES_OPEN
+						| (owned ? G_APPLICATION_NON_UNIQUE : 0),
 					nullptr)));
 
 		app->signal_startup().connect([=] {