Anchored diffs (like git diff --anchored=...)

[fffergal]

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I really like making my PRs as approachable for the reviewers as possible, and the file browser and whole file comments have really helped. I made a a PR for an "extract function" refactoring today, and noticed the diff was broken up into sections based on common lines, like a nearby function with a similar signature to the new function. This makes it less clear a block of code has been moved into a new function. With an over the shoulder review I would use git diff main... --anchored=' def the_other_function(' and that would show my changes as one big block again. It would be great if I could type in anchored text for each file while I'm preparing my PR, a bit like the whole file comments, and it would be preserved for the reviewers too.