[PATCH 1 of 4 RFC] scmutil: changed revrange to return lazysets for new style revsets

[Lucas Moscovicz]

# HG changeset patch
# User Lucas Moscovicz <lmoscovicz at fb.com>
# Date 1392247827 28800
#      Wed Feb 12 15:30:27 2014 -0800
# Node ID 91b77bbaa0970724742e9d2700e1123403b9d386
# Parent  d9bb5abb1c584e3e04ac3632805ff8886b1a2973
scmutil: changed revrange to return lazysets for new style revsets

When there is an old style revset or both it will still return a baseset. This
may be changed in later patches.

diff --git a/mercurial/scmutil.py b/mercurial/scmutil.py
--- a/mercurial/scmutil.py
+++ b/mercurial/scmutil.py
@@ -524,11 +524,14 @@
 
         # fall through to new-style queries if old-style fails
         m = revset.match(repo.ui, spec)
-        dl = [r for r in m(repo, revset.spanset(repo)) if r not in seen]
-        l.extend(dl)
-        seen.update(dl)
+        if seen or l:
+            dl = [r for r in m(repo, revset.spanset(repo)) if r not in seen]
+            l.extend(dl)
+            seen.update(dl)
+        else:
+            l = m(repo, revset.spanset(repo))
 
-    return revset.baseset(l)
+    return l
 
 def expandpats(pats):
     if not util.expandglobs: