Re: [PATCH] difftool: avoid symlinks when reusing worktree files

David Aguilar [off-list ref] writes:

-	if (! -f "$workdir/$file") {
-		return (0, $null_sha1);
+	my $workfile = "$workdir/$file";
+	if (-f $workfile && ! -l $workfile) {

I still don't know if return (0, $null) is the right thing to do,
but in any case, I find the original flow easier to read, i.e. "we
notice a few cases we cannot do the main 'hash-object' thing this
function is meant to do and return early".  I.e.

	if (-l "$workdir/$file" || ! -f _) {
        	return (0, $null_sha1);
	}
	my $wt_sha1 = $repo->command_oneline('hash-object', "$workdir/$file");
	my $use = ($sha1 eq $null_sha1) || ($sha1 eq $wt_sha1);
	return ($use, $wt_sha1);