R1:b8f4f7c43887

Fix an issue with Diffusion's display of copied files in Git

Summary: If a change copies some file `A` to `B` and also edits `A`, we currently record this as an indirect change and don't show the edits to `A` in the diff. Instead, record these as direct changes.

Test Plan: Created two commits, one which copied `A` to `B` without modifying `A` and one which copied `A` to `B` and modified A. Viewed both commits in Diffusion. The unmodified commit did not show `A`, and the modified commit did (with the…