store: invoke "os.path.isdir()" via vfs

This patch invokes "os.path.isdir()" via "rawvfs" object to avoid
filename encoding, because the path passed to "os.path.isdir()"
shouldn't be encoded.

This patch newly adds "self.rawvfs" field only to "basicstore" and
"encodedstore", because "fncachestore" has "self.rawvfs" already.

mercurial/store.py

@@ -295,6 +295,7 b' class basicstore(object):'
         self.path = vfs.base
         self.createmode = _calcmode(vfs)
         vfs.createmode = self.createmode
+        self.rawvfs = vfs
         self.vfs = scmutil.filtervfs(vfs, encodedir)
         self.opener = self.vfs
 
@@ -308,7 +309,7 b' class basicstore(object):'
             path += '/' + relpath
         striplen = len(self.path) + 1
         l = []
-        if os.path.isdir(path):
+        if self.rawvfs.isdir(path):
             visit = [path]
             while visit:
                 p = visit.pop()
@@ -346,6 +347,7 b' class encodedstore(basicstore):'
         self.path = vfs.base
         self.createmode = _calcmode(vfs)
         vfs.createmode = self.createmode
+        self.rawvfs = vfs
         self.vfs = scmutil.filtervfs(vfs, encodefilename)
         self.opener = self.vfs