shelve: unshelve using an unfiltered repository

when evolve is enabled and a hidden obsolete changeset exists
in the repository, the strip during unshelve will fail due to
filtered revs. we use an unfiltered repository like to
repair.strip to strip the proper nodes.

hgext/shelve.py

@@ -610,7 +610,7 b' def unshelve(ui, repo, *shelved, **opts)'
         # but it doesn't update the inmemory structures, so addchangegroup
         # hooks still fire and try to operate on the missing commits.
         # Clean up manually to prevent this.
-        repo.changelog.strip(oldtiprev, tr)
+        repo.unfiltered().changelog.strip(oldtiprev, tr)
 
         unshelvecleanup(ui, repo, basename, opts)
     finally:

tests/test-shelve.t

@@ -520,4 +520,23 b' unshelve should work on an ancestor of t'
   $ hg status
   A d
 
+test bug 4073 we need to enable obsolete markers for it
+
+  $ cat > ../obs.py << EOF
+  > import mercurial.obsolete
+  > mercurial.obsolete._enabled = True
+  > EOF
+  $ echo '[extensions]' >> $HGRCPATH
+  $ echo "obs=${TESTTMP}/obs.py" >> $HGRCPATH
+  $ hg shelve
+  shelved as default
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  $ hg debugobsolete `hg --debug id -i -r 1`
+  $ hg unshelve
+  unshelving change 'default'
+  adding changesets
+  adding manifests
+  adding file changes
+  added 1 changesets with 1 changes to 2 files (+1 heads)
+
   $ cd ..