histedit: ignores hidden revision when checking for orphaned nodes

We do not want hidden revision to block histedit. They are already "dead"
and we do not care about dead orphans. see similar changeset 9e2dc0d292cd for
rebase.

hgext/histedit.py

@@ -588,7 +588,7 b' def between(repo, old, new, keep):'
 
     When keep is false, the specified set can't have children."""
     revs = list(repo.set('%n::%n', old, new))
-    if not keep and repo.revs('(%ld::) - %ld', revs, revs):
+    if not keep and repo.revs('(%ld::) - (%ld + hidden())', revs, revs):
         raise util.Abort(_('cannot edit history that would orphan nodes'))
     return [c.node() for c in revs]
 

tests/test-histedit-obsolete.t

@@ -92,3 +92,32 b' Enable obsolete'
   d2ae7f538514cd87c17547b0de4cea71fe1af9fb 0 {'date': '*', 'user': 'test'} (glob)
   055a42cdd88768532f9cf79daa407fc8d138de9b ae467701c5006bf21ffcfdb555b3d6b63280b6b7 0 {'date': '*': 'test'} (glob)
   177f92b773850b59254aa5e923436f921b55483b d36c0562f908c692f5204d606d4ff3537d41f1bf 0 {'date': '*', 'user': 'test'} (glob)
+
+Ensure hidden revision does not prevent histedit
+-------------------------------------------------
+
+create an hidden revision
+
+  $ cat > commands.txt <<EOF
+  > pick d36c0562f908 6 c
+  > drop ae467701c500 7 d
+  > pick 0efacef7cb48 8 f
+  > EOF
+  $ hg histedit 6 --commands commands.txt
+  0 files updated, 0 files merged, 3 files removed, 0 files unresolved
+  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ hg log --graph
+  @  9:7c044e3e33a9 f
+  |
+  o  6:d36c0562f908 c
+  |
+  o  0:cb9a9f314b8b a
+  
+check hidden revision are ignored (6 have hidden children 7 and 8)
+
+  $ cat > commands.txt <<EOF
+  > pick d36c0562f908 6 c
+  > pick 7c044e3e33a9 8 f
+  > EOF
+  $ hg histedit 6 --commands commands.txt
+  0 files updated, 0 files merged, 0 files removed, 0 files unresolved