dirstate: rebuild should update dirstate properly

Updating dirstate by simply adding and dropping files from self._map doesn't
keep the other maps updated (think: _dirs, _copymap, _foldmap, _nonormalset)
thus introducing cache inconsistency.

This is also affecting the debugstate tests since now we don't even try to set
correct mode and mtime for the files because they are marked dirty anyway and
will be checked during next status call.

mercurial/dirstate.py

@@ -680,21 +680,15 b' class dirstate(object):'
             self.clear()
             self._lastnormaltime = lastnormaltime
 
-        for f in changedfiles:
-            mode = 0o666
-            if f in allfiles and 'x' in allfiles.flags(f):
-                mode = 0o777
-
-            if f in allfiles:
-                self._map[f] = dirstatetuple('n', mode, -1, 0)
-            else:
-                self._map.pop(f, None)
-                if f in self._nonnormalset:
-                    self._nonnormalset.remove(f)
-
         if self._origpl is None:
             self._origpl = self._pl
         self._pl = (parent, nullid)
+        for f in changedfiles:
+            if f in allfiles:
+                self.normallookup(f)
+            else:
+                self.drop(f)
+
         self._dirty = True
 
     def write(self, tr):

tests/test-rebuildstate.t

@@ -48,8 +48,8 b' basic test for hg debugrebuildstate'
 state dump after
 
   $ hg debugstate --nodates | sort
-  n 644         -1 set                 bar
-  n 644         -1 set                 foo
+  n   0         -1 unset               bar
+  n   0         -1 unset               foo
 
   $ hg debugadddrop --normal-lookup file1 file2
   $ hg debugadddrop --drop bar
@@ -57,7 +57,7 b' state dump after'
   $ hg debugstate --nodates
   n   0         -1 unset               file1
   n   0         -1 unset               file2
-  n 644         -1 set                 foo
+  n   0         -1 unset               foo
   $ hg debugrebuildstate
 
 status
@@ -115,7 +115,7 b' dirstate'
   $ hg debugrebuilddirstate --minimal
   $ hg debugdirstate --nodates
   r   0          0 * bar (glob)
-  n 644         -1 * foo (glob)
+  n   0         -1 * foo (glob)
   a   0         -1 * qux (glob)
   $ hg status -A
   A qux