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How to keep git blame ignored commits up to date?

When I make a separate commit for code cleanup / style changes, I can suppress that commit from `git blame` so that I can follow a file's history easily without getting distracted bu pure style changes. I do that by putting the cleanup commit's hash in a file and tell git to ignore those commits for blaming purposes:
```sh
echo $the_full_hash >> .git-blame-ignore-revs
git config blame.ignoreRevsFile .git-blame-ignore-revs
```
But at the time I make my cleanup commit, I don't have the hash yet, so I need an extra commit to update `.git-blame-ignore-revs`. I'd rather have that in the same commit.
Even if I can get the hash of my current working copy changes, adding that hash to `.git-blame-ignore-revs` would modify what I am committing, resulting in a different hash, as `.git-blame-ignore-revs` is also checked in.
On top of that, if I make 2 commits and then use github's PR squashing merge, my hash in `.git-blame-ignore-revs` is wrong as only the squashed commit makes it into git, not the individual ones.
How do people keep their `.git-blame-ignore-revs` up to date? Is there a better way than 2 commits?

When I make a separate commit for code cleanup / style changes, I can suppress that commit from `git blame` so that I can follow a file's history easily without getting distracted by pure style changes. I do that by putting the cleanup commit's hash in a file and tell git to ignore those commits for blaming purposes:
```sh
echo $the_full_hash >> .git-blame-ignore-revs
git config blame.ignoreRevsFile .git-blame-ignore-revs
```
But at the time I make my cleanup commit, I don't have the hash yet, so I need an extra commit to update `.git-blame-ignore-revs`. I'd rather have that in the same commit.
Even if I can get the hash of my current working copy changes, adding that hash to `.git-blame-ignore-revs` would modify what I am committing, resulting in a different hash, as `.git-blame-ignore-revs` is also checked in.
On top of that, if I make 2 commits and then use github's PR squashing merge, my hash in `.git-blame-ignore-revs` is wrong as only the squashed commit makes it into git, not the individual ones.
How do people keep their `.git-blame-ignore-revs` up to date? Is there a better way than 2 commits?

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