pack_dirstate: only invalidate mtime for files written in the last second...
pack_dirstate: only invalidate mtime for files written in the last second
Previously we'd place files written in the last second in the lookup set. This
can lead to pathological cases where a file always remains in the lookup set if
it gets modified before the next time status is run.
With this patch, only the mtime of those files is invalidated. This means that
if a file's size or mode changes, we can immediately declare it as modified
without needing to compare file contents.
