Also set XDG_SESSION_TYPE

backend/session/logind.c

@@ -250,12 +250,18 @@ static bool set_type(struct logind_session *session) {
 		session->path, "org.freedesktop.login1.Session", "SetType",
 		&error, &msg, "s", "wayland");
 	if (ret < 0) {
-		wlr_log(WLR_ERROR, "Failed to set session type for session: %s",
+		wlr_log(WLR_ERROR, "Failed to set logind session type for session: %s",
 			error.message);
 	}
 
 	sd_bus_error_free(&error);
 	sd_bus_message_unref(msg);
+
+	ret = setenv("XDG_SESSION_TYPE", "wayland", 1);
+	if (ret < 0) {
+		wlr_log(WLR_ERROR, "Failed to set XDG_SESSION_TYPE for session");
+	}
+
 	return ret >= 0;
 }