.git-blame-ignore-revs

One concern people have about taking spelling fixes (or whitespace cleanup for that matter) is that blame is shifted (potentially for large swaths of the codebase) to a drive-by contributor.

It's actually possible to partially address this with the introduction of a file.

Consensus for the filename appears to be .git-blame-ignore-revs:

• Docs: Support in GitHub for .git-blame-ignore-revs (since March 2022)
• Rob Allen: Ignoring mass reformatting commits with git blame
• Moxio: Ignoring bulk change commits with git blame
• Used in Chromium
• Request to support in GitLab

This isn't something that a cleanup PR itself should include, because it's reliant on the final commit-refs which aren't known until the PR is merged (especially if a project rebases, but also it'd be painful to maintain while responding to reviews).

But it shouldn't be particularly hard to write a bot which given a bunch of GitHub (or GitLab) PRs (or commits) generated a PR (or just a commit) to update the file.

It seems like a pretty neat small project, which someone could/should do.

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