bookmarks: read current bookmark as utf-8 and convert it to local

mercurial/bookmarks.py

@@ -38,7 +38,7 b' def readcurrent(repo):'
     if os.path.exists(repo.join('bookmarks.current')):
         file = repo.opener('bookmarks.current')
         # No readline() in posixfile_nt, reading everything is cheap
-        mark = (file.readlines() or [''])[0]
+        mark = encoding.tolocal((file.readlines() or [''])[0])
         if mark == '':
             mark = None
         file.close()