manifest: make uses of _mancache aware of contexts

In a future patch we will change manifestctx and treemanifestctx to no longer
derive from manifestdict and treemanifest, respectively. This means that
consumers of the _mancache will now need to be aware of the different between
the two, until we get rid of the manifest entirely and the _mancache becomes
only filled with ctxs.

mercurial/bundlerepo.py

@@ -204,8 +204,8 b' class bundlemanifest(bundlerevlog, manif'
         if isinstance(node, int):
             node = self.node(node)
 
-        if node in self._mancache:
-            result = self._mancache[node].text()
+        if node in self.fulltextcache:
+            result = self.fulltextcache[node].tostring()
         else:
             result = manifest.manifest.revision(self, nodeorrev)
         return result

mercurial/manifest.py

@@ -1130,7 +1130,11 b' class manifest(manifestrevlog):'
         if node == revlog.nullid:
             return self._newmanifest() # don't upset local cache
         if node in self._mancache:
-            return self._mancache[node]
+            cached = self._mancache[node]
+            if (isinstance(cached, manifestctx) or
+                isinstance(cached, treemanifestctx)):
+                cached = cached.read()
+            return cached
         if self._treeondisk:
             def gettext():
                 return self.revision(node)