Re: Regression in `git diff --quiet HEAD` when a new file is staged

> 
> /* return 1 if any change is found; otherwise, return 0 */
> static int diff_flush_patch_quietly(struct diff_filepair *p, struct diff_options *o)
> {
> @@ -6179,6 +6181,15 @@ static int diff_flush_patch_quietly(struct diff_filepair *p, struct diff_options
> int saved_found_changes = o->found_changes;
> int ret;
> 
> + /*
> + * run diff_flush_patch for the exit status. setting
> + * options->file to /dev/null should be safe, because we
> + * aren't supposed to produce any output anyway.
> + */
> + diff_free_file(o);
> + o->file = xfopen("/dev/null", "w");
> + o->close_file = 1;
> + o->color_moved = 0;
> o->dry_run = 1;
> o->found_changes = 0;
> diff_flush_patch(p, o);
>