[PATCH V3] histedit: improve error when run on nodes with children (issue5056)

[liscju]

# HG changeset patch
# User liscju <piotr.listkiewicz at gmail.com>
# Date 1456755146 -3600
#      Mon Feb 29 15:12:26 2016 +0100
# Node ID e8daf8d45d2cc6cc95352ed7255f0f9090bbbea9
# Parent  41dcd754526612c43b9695df8851557c851828ef
histedit: improve error when run on nodes with children (issue5056)

diff -r 41dcd7545266 -r e8daf8d45d2c hgext/histedit.py
--- a/hgext/histedit.py	Wed Feb 24 15:55:44 2016 -0600
+++ b/hgext/histedit.py	Mon Feb 29 15:12:26 2016 +0100
@@ -1282,7 +1282,8 @@ def between(repo, old, new, keep):
     if ctxs and not keep:
         if (not obsolete.isenabled(repo, obsolete.allowunstableopt) and
             repo.revs('(%ld::) - (%ld)', ctxs, ctxs)):
-            raise error.Abort(_('cannot edit history that would orphan nodes'))
+            raise error.Abort(_('can only histedit a changeset together '
+                                'with all its descendants'))
         if repo.revs('(%ld) and merge()', ctxs):
             raise error.Abort(_('cannot edit history that contains merges'))
         root = ctxs[0] # list is already sorted by repo.set