Worked on the opensumi/core repository to address a critical issue in the file dialog’s default path resolution. Focused on front-end development using React and TypeScript, the developer fixed a bug by ensuring the FileTreeDialogModel was provided to the getDefaultFilePath function and updated all relevant call sites to use this model. This targeted change eliminated incorrect default directories, improving the reliability and user experience of file opening and saving workflows. The solution was implemented with a clear scope and minimal risk, maintaining traceability through a dedicated commit and demonstrating careful attention to both code quality and user-facing functionality.