Add .git-blame-ignore-revs

[CasualPokePlayer]

This could be used for ignoring giant whitespace changes in git blames.
With this we could commit to doing giant tab/space + newline normalization in .cs files without blame noise. edit: and trailing newlines --yoshi
The commit used here is used more for POC, although still nice for getting rid of the blame noise from it.

• I, the committer, have read the licensing terms for contributors (last updated 2022-07-15) and am compliant

[YoshiRulz]

GitHub doesn't respect this in file history (example). I still like this idea though.

[Morilli]

Well, this feature seems to be intended for git blame only; it works here: https://github.com/YoshiRulz/git-blame-ignore-revs-poc/blame/master/src/BizHawk.Client.EmuHawk/EmuHawkUtil.cs

[YoshiRulz]

it works here

...or would, if the commit changed any lines in that file.

I've actually changed my mind and am now skeptical of this feature. How exactly does it "see beyond" the filtered commit(s)? Does it only try if the filter commit(s) are whitespace-only? In any case, I'd like to see it in action.

edit: Having reviewed the docs, it seems this has no downsides if we ensure it's only used for trivial whitespace changes. I'm still a bit disappointed that GitHub doesn't use this to glue file history together, but maybe there's another tool that does. GitHub now does that regardless of this file.

some more commits to consider:

• ed3bf0e (blank git diff -w)
• fec63fb (blank git diff -w)
• 3a3b22c (git diff -w is only renames)
• 3ea71a2 (git diff -w is only a few LOC)

[Morilli]

https://github.com/Morilli/BizHawk/blame/master/.editorconfig ... I think that's working?

[YoshiRulz]

Care to revisit this? As per my edits above, I think we should use this feature only for whitespace changes (and file renames).