localrepo: deprecated 'repo.wopener' (API)

The "new" 'repo.wvfs' attribute have been around for almost 5 years. I think we
can deprecate the old form now ;-)

mercurial/localrepo.py

@@ -260,7 +260,6 b' class localrepository(object):'
         self.vfs = None
         # vfs to access the store part of the repository
         self.svfs = None
-        self.wopener = self.wvfs
         self.root = self.wvfs.base
         self.path = self.wvfs.join(".hg")
         self.origroot = path
@@ -380,6 +379,11 b' class localrepository(object):'
         # generic mapping between names and nodes
         self.names = namespaces.namespaces()
 
+    @property
+    def wopener(self):
+        self.ui.deprecwarn("use 'repo.wvfs' instead of 'repo.wopener'", '4.2')
+        return self.wvfs
+
     def close(self):
         self._writecaches()