Re: log: option "--follow" not the default for a single file?

Jeff King [off-list ref] writes:

  2. It can be slower than a regular traversal, since we have to do
     rename detection whenever we see a deletion. In practice I don't
     think it is much slower, though (mainly because files don't get
     moved all that much).

There is no difference between a regular traversal and a follow traversal
while the path is still there. When a path disappear during a regular
traversal, most likely the remaining traversal will yield nothing but the
user has already seen what is there to see. If a follow traversal was in
use, the user has seen the same as the regular traversal up to that point,
we spend a bit of time in rename detection, and then we start showing the
result of the traversal using an updated pathspec. I doubt that "slowness"
is an issue here.