Function diff_commits_with_renames 

pub fn diff_commits_with_renames(
    odb: &Odb,
    base: &ObjectId,
    tip: &ObjectId,
    rename_threshold: u32,
) -> Result<Vec<DiffEntry>>

Diff the trees at two commits and pair deleted/added paths as renames when similar enough.

rename_threshold is Git’s -M percentage (0–100, inclusive). Use RENAME_DETECTION_DISABLED to skip rename detection.

Errors

Propagates object read errors and tree diff failures.