Handle unknown files better on update

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Handle unknown files better on update

If we spot an unknown file that's identical to one that's in the
update, we get the updated one so that it shows up in the dirstate
properly.

manifest hash: 988aca64f255df67c27d1c6f8694ea098e4ec159
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mercurial/hg.py

@@ -1092,9 +1092,12 b' class localrepository:'
         # construct a working dir manifest
         mw = m1.copy()
         mfw = mf1.copy()
+        umap = dict.fromkeys(u)
+
         for f in a + c + u:
             mw[f] = ""
             mfw[f] = util.is_exec(self.wjoin(f), mfw.get(f, False))
+
         for f in d:
             if f in mw: del mw[f]
 
@@ -1106,6 +1109,7 b' class localrepository:'
             if linear_path and f not in m2:
                 self.dirstate.forget((f,))
 
+        # Compare manifests
         for f, n in mw.iteritems():
             if f in m2:
                 s = 0
@@ -1140,6 +1144,9 b' class localrepository:'
                         s = 1
                     else:
                         mark[f] = 1
+                elif f in umap:
+                    # this unknown file is the same as the checkout
+                    get[f] = m2[f]
 
                 if not s and mfw[f] != mf2[f]:
                     if force: