[PATCH v2] new: Don't scan unchanged directories with no sub-directories

[David Bremner]

Austin Clements <amdragon at MIT.EDU> writes:

> This can substantially reduce the cost of notmuch new in some
> situations, such as when the file system cache is cold or when the
> Maildir is on NFS.
> ---

pushed as commit 516efb7807

d