changegroup: drop special-casing of flat manifests...
changegroup: drop special-casing of flat manifests
Since
c08814b48ae5 (changegroup: avoid iterating the whole manifest,
2015-12-04), the manifest linkrev callback iterates over only the
files that were touched according the the changeset. Before that
change, we iterated over all files returned in
manifest.readfast(). That method returns the files in the delta, if
the delta parent is a parent, otherwise it returns the full
manifest. Most manifest revisions end up using one of the parents as
its delta parent, so most of the time, the method returns a short
manifest. It seems that that happens often enough that it doesn't
really matter; I could not reproduce the timings reported in that
change.
Since the treemanifest code now works quite differently, and since
that code also works correctly for flat manifests, let's drop the
special-casing of flat manifests.
