Encoding Issue when comparing commits

[shoedler]

So I have an issue with encoding. I first thought the Problem would lie within the split-diff package.
But that isn't the case.

I use Windows 1252 encoding. Now when I compare file A to file B directly - it doesn't show any differences (Well, since the filenames are different split-diff shows the whole file as a difference), since both files are Windows 1252 encoded and split-diff seems to use the encoding of the file.

But as soon as I compare for example the local version of file A to an older version of file A, it sees all umlauts ä,ö,ü as ?

Which obviously shows up as a difference.

Now to narrow the issue down, this is what happens when I compare commit to commit:

They show up identical - except the 2.

To me, it looks like, time-machine somehow shows commits in the wrong encoding type.
I use Git for Windows and used TortoiseGit before Atom. I've diffed the same file with TortoiseGit and it shows it the right way.

Any ideas?