linkrev: use the right manifest content when adjusting linrev (issue4499)...
linkrev: use the right manifest content when adjusting linrev (issue4499)
When the manifest revision is stored as a delta against a non-parent revision,
'_adjustlinkrev' could miss some file update because it was using the delta
only. We now use the 'fastread' method that uses the delta only when it makes
sense.
A test showcasing on the of possible issue have been added.
