During November 2025, contributed to the microsoft/git repository by implementing rename-aware external diff support for gitk, addressing the challenge of viewing diffs when files are renamed between commits. This feature detects file renames and ensures that external diff tools receive the correct original and renamed file paths, allowing seamless diff viewing regardless of path changes. The work involved Tcl scripting and deep integration with git’s version control mechanisms. Collaborated closely with other contributors to validate rename detection and path handling, thoroughly testing the end-to-end workflow to reinforce the reliability and usability of external diffs in complex versioning scenarios.