Over two months, contributed to macvim-dev/macvim and vim/vim by enhancing language integration and user interface consistency. Focused on stabilizing Rustfmt integration in macvim-dev/macvim, restoring error display and adding configurable formatting options using C and Vim script, which improved code quality and reduced debugging time. Addressed a Haskell completion bug to ensure reliable code suggestions, and enhanced the preview popup in vim/vim with customizable borders, resizing, and shadow features for a more consistent UI. Demonstrated strong collaboration through multi-signer commits and maintained high code quality, supporting maintainability and usability for developers working with Vim and MacVim plugins.