Re: [PATCH 3/4] add -u: only show pathless 'add -u' warning when changes exist outside cwd

Duy Nguyen wrote:

My concern is run full-tree diff can be expensive on large repos (one
of the reasons the user may choose to work from within a
subdirectory). We can exit as soon as we find a difference outside
$prefix. But in case we find nothing, we need to diff the whole
worktree.

Yes.  This is an argument for the single-diff approach that Junio
suggested, since at least it's not significantly slower than the
future default behavior ("git add -u :/").

Sysadmins and others helping to train users will need to make sure
people working on large repos understand that they can use "git add -u ."
to avoid a speed penalty.

Thanks for looking it over,
Jonathan