mercurial/cmdutil.py

--- a/mercurial/cmdutil.py	Tue Aug 01 21:03:25 2017 +0900
+++ b/mercurial/cmdutil.py	Wed Jul 26 22:10:15 2017 +0900
@@ -3218,7 +3218,7 @@
             pass
         repo.dirstate.remove(f)
 
-    audit_path = pathutil.pathauditor(repo.root)
+    audit_path = pathutil.pathauditor(repo.root, cached=True)
     for f in actions['forget'][0]:
         if interactive:
             choice = repo.ui.promptchoice(