How to set character set seperately for git messages and file diff view?

[Gold John King]

Hi, Visual Studio uses GB2312 by default for Chinese characters.

And my git server uses UTF-8 for git commit messages / git log.

If I select either of those character set in Sourcetree settings, the other one would become a mess.

Is it possible to set them seperately, if not, would it be added at a future version?

Thanks.