On 2023-02-27, Bram Moolenaar wrote:
> So, can this issue be closed, or should we change something in Vim?
> E.g. adding that :unlet command in the diff filetype plugin?

I think it could be closed, but it's not my issue.  I don't think
there is anything to change in Vim.  There are a few other GIT_
environment variables that I unlet in my vimrc because their
presence causes odd behavior of git commands launched from Vim or in
subshells of Vim, but some users may want to know about the presence
of those variables or their values, so I wouldn't automatically
unlet them in, say, defaults.vim.

The "git difftool" command opens files in their normal file type, so
the diff filetype plugin wouldn't apply.  By the time the "git diff"
command is executed, it's too late to change the command's behavior.
At least that's what I observe with my bash, git and Vim
configurations.

Regards,
Gary

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