Only works with new files

[surfer190]

I have noticed that this only works with new files.

@borisguery @hkdobrev

Modifying an existing file with the debug commands does not detect and shows All files are clean

[hkdobrev]

@surfer190 Could you please modify an existing file, stage it and see if this command gives you any output:

git diff-index --cached --name-only --diff-filter=ACMR HEAD

The M in the --diff-filter option indicates files which were modified.