histedit: pass multiple nodes to strip (BC)

Previously, histedit.cleanupnode pass root nodes one by one. Since
repair.strip takes multiple nodes and can handle them just fine, pass all
strip roots at once.

This is BC because the number of strip backup files may change from N to 1.

hgext/histedit.py

@@ -1603,11 +1603,8 b' def cleanupnode(ui, repo, nodes):'
         nm = repo.changelog.nodemap
         nodes = sorted(n for n in nodes if n in nm)
         roots = [c.node() for c in repo.set("roots(%ln)", nodes)]
-        for c in roots:
-            # We should process node in reverse order to strip tip most first.
-            # but this trigger a bug in changegroup hook.
-            # This would reduce bundle overhead
-            repair.strip(ui, repo, c)
+        if roots:
+            repair.strip(ui, repo, roots)
 
 def safecleanupnode(ui, repo, nodes):
     """strip or obsolete nodes