git diff autocomplete

[Dhaval Patel]

How to reproduce

git init
touch abc.txt
touch abd.txt
git add a*
git commit -m 'first commit'
echo 'hello' > abc.txt
git add a[PRESS TAB]
(This will autocomplete 'git add abc.txt')
git diff a[PRESS TAB]
(This will not give 'git diff abc.txt')

Suggested feature -

when I press tab, git diff should autocomplete just like git add.