rebase: expand a long "one-liner"

When a one-liner gets 3 lines longs, it lose its expressivity benefits. We
expand it into a simple for loop. This makes future changes of the code in
that area clearer.

hgext/rebase.py

@@ -1783,9 +1783,10 b' def clearrebased(ui, repo, destmap, stat'
         hf = fm.hexfunc
         fl = fm.formatlist
         fd = fm.formatdict
-        nodechanges = fd({hf(oldn): fl([hf(n) for n in newn], name='node')
-                          for oldn, newn in replacements.iteritems()},
-                         key="oldnode", value="newnodes")
+        changes = {}
+        for oldn, newn in replacements.iteritems():
+            changes[hf(oldn)] = fl([hf(n) for n in newn], name='node')
+        nodechanges = fd(changes, key="oldnode", value="newnodes")
         fm.data(nodechanges=nodechanges)
 
 def pullrebase(orig, ui, repo, *args, **opts):