basectx: move filenode from changectx

mercurial/context.py

@@ -110,6 +110,9 b' class basectx(object):'
 
         return node, flag
 
+    def filenode(self, path):
+        return self._fileinfo(path)[0]
+
 class changectx(basectx):
     """A changecontext object makes access to data related to a particular
     changeset convenient. It represents a read-only context already presnt in
@@ -331,9 +334,6 b' class changectx(basectx):'
             troubles.append('divergent')
         return troubles
 
-    def filenode(self, path):
-        return self._fileinfo(path)[0]
-
     def flags(self, path):
         try:
             return self._fileinfo(path)[1]