histedit: fix preventing strips during histedit

We were trying to prevent strips of important nodes during histedit,
but the check was actually comparing the short hashes in the rules to
the exact value the user typed in, so it only ever worked if the user
typed a 12 character hash.

hgext/histedit.py

@@ -1030,8 +1030,9 b' def stripwrapper(orig, ui, repo, nodelis'
     if os.path.exists(os.path.join(repo.path, 'histedit-state')):
         state = histeditstate(repo)
         state.read()
-        histedit_nodes = set([ctx for (action, ctx) in state.rules])
-        strip_nodes = set([repo[n].hex() for n in nodelist])
+        histedit_nodes = set([repo[rulehash].node() for (action, rulehash)
+                             in state.rules if rulehash in repo])
+        strip_nodes = set([repo[n].node() for n in nodelist])
         common_nodes = histedit_nodes & strip_nodes
         if common_nodes:
             raise util.Abort(_("histedit in progress, can't strip %s")

tests/test-histedit-edit.t

@@ -87,8 +87,8 b' Go at a random point and try to continue'
   [255]
 
 Try to delete necessary commit
-  $ hg strip -r 652413bf663e
-  abort: histedit in progress, can't strip 363532343133
+  $ hg strip -r 652413b
+  abort: histedit in progress, can't strip 652413bf663e
   [255]
 
 commit, then edit the revision