pub fn format_hunk_header(
old_start: usize,
old_count: usize,
new_start: usize,
new_count: usize,
) -> StringExpand description
Formats a git-compatible @@ -old +new @@ hunk header.
Range counts are preserved rather than collapsed to start-only form: a
pure deletion such as @@ -65,19 +65,0 @@ must not read as a one-line
change. Counts of one are elided (@@ -1 +1 @@) to match git diff.