git difftool ignores textconv driver

Question

git diff takes into account my textconv driver, but git difftool -d --textconv does not. Why? How to fix it?

My ~/.gitconfig contains among other settings:

[diff]
    tool = default-difftool
[difftool "default-difftool"]
    cmd = vim -f '+next' '+execute \"DirDiff\" argv(0) argv(1)' $LOCAL $REMOTE '+syntax off'
[diff "ipynb"]
    textconv = nbcatsrc

And my .gitattributes is:

*.ipynb diff=ipynb

Answer 1

It's true that git difftool ignores textconv. An explanation and workaround is found here:

Is git difftool on binaries possible? If so, how does one configure it?