Worked on improving the reliability and maintainability of the delayed shutdown process in the linuxdeepin/dde-session-shell repository. Focused on simplifying the shutdown sequence by removing the waitForAppPreparing dependency and decoupling the logic from system configuration, which reduced the risk of edge-case failures and made deployment more consistent across different environments. Utilized C++ and the Qt Framework to streamline the code path, making it easier to test and maintain. The changes addressed a key bug, ensuring that delayed shutdowns no longer relied on specific configurations, ultimately enhancing the robustness of system programming within the session shell component.