Re: [RFC PATCH 2/3] usage: prefix all lines in `vreportf()`, not just the first

> diff --git a/t/t1011-read-tree-sparse-checkout.sh b/t/t1011-read-tree-sparse-checkout.sh
> index 0c6f48f302..31b0702e6c 100755
> --- a/t/t1011-read-tree-sparse-checkout.sh
> +++ b/t/t1011-read-tree-sparse-checkout.sh
> @@ -243,9 +243,9 @@ test_expect_success 'print errors when failed to update worktree' '
>  	test_must_fail git checkout top 2>actual &&
>  	cat >expected <<\EOF &&
>  error: The following untracked working tree files would be overwritten by checkout:
> -	sub/added
> -	sub/addedtoo
> -Please move or remove them before you switch branches.
> +error: 	sub/added
> +error: 	sub/addedtoo
> +error: Please move or remove them before you switch branches.
>  Aborting
>  EOF

> diff --git a/t/t1506-rev-parse-diagnosis.sh b/t/t1506-rev-parse-diagnosis.sh
> index 4ee009da66..80d35087b7 100755
> --- a/t/t1506-rev-parse-diagnosis.sh
> +++ b/t/t1506-rev-parse-diagnosis.sh
> @@ -11,7 +11,7 @@ test_did_you_mean ()
>  	sq="'" &&
>  	cat >expected <<-EOF &&
>  	fatal: Path '$2$3' $4, but not ${5:-$sq$3$sq}.
> -	Did you mean '$1:$2$3'${2:+ aka $sq$1:./$3$sq}?
> +	fatal: Did you mean '$1:$2$3'${2:+ aka $sq$1:./$3$sq}?
>  	EOF

> diff --git a/usage.c b/usage.c
> index 80f9c1d14b..6a5669922f 100644
> --- a/usage.c
> +++ b/usage.c
> @@ -34,7 +34,7 @@ void vreportf(const char *prefix, const char *err, va_list params)
>  		if (iscntrl(*p) && *p != '\t' && *p != '\n')
>  			*p = '?';
>  	}
> -	fprintf(stderr, "%s%s\n", prefix, msg);
> +	prefix_suffix_lines(stderr, prefix, msg, "");
>  }