repair: use cg3 for treemanifests stable

repair: use cg3 for treemanifests

The newly created helper changegroup.safeversion() knows to pick
version 03 if the repo uses treemanifests, so just using that means we
pick the right changegroup version.

--- a/mercurial/repair.py	Tue Jan 19 15:32:32 2016 -0800
+++ b/mercurial/repair.py	Tue Jan 19 15:38:24 2016 -0800
@@ -22,9 +22,7 @@
 
 def _bundle(repo, bases, heads, node, suffix, compress=True):
     """create a bundle with the specified revisions as a backup"""
-    cgversion = '01'
-    if 'generaldelta' in repo.requirements:
-        cgversion = '02'
+    cgversion = changegroup.safeversion(repo)
 
     cg = changegroup.changegroupsubset(repo, bases, heads, 'strip',
                                        version=cgversion)

--- a/tests/test-treemanifest.t	Tue Jan 19 15:32:32 2016 -0800
+++ b/tests/test-treemanifest.t	Tue Jan 19 15:38:24 2016 -0800
@@ -285,6 +285,17 @@
        1       127     111      0       5 25ecb8cb8618 000000000000 000000000000
        2       238      55      1       6 5b16163a30c6 25ecb8cb8618 000000000000
 
+Stripping and recovering changes should work
+
+  $ hg st --change tip
+  M dir1/a
+  $ hg --config extensions.strip= strip tip
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  saved backup bundle to $TESTTMP/repo-mixed/.hg/strip-backup/51cfd7b1e13b-78a2f3ed-backup.hg (glob)
+  $ hg unbundle -q .hg/strip-backup/*
+  $ hg st --change tip
+  M dir1/a
+
 Create deeper repo with tree manifests.
 
   $ cd ..