diff -r 16454d938299 -r 718e9b444d97 mercurial/commands.py
--- a/mercurial/commands.py	Wed Jan 30 16:59:31 2019 -0800
+++ b/mercurial/commands.py	Wed Jan 30 17:05:09 2019 -0800
@@ -2848,6 +2848,7 @@
                 for i in pycompat.xrange(blo, bhi):
                     yield ('+', b[i])
 
+    uipathfn = scmutil.getuipathfn(repo)
     def display(fm, fn, ctx, pstates, states):
         rev = scmutil.intrev(ctx)
         if fm.isplain():
@@ -2875,8 +2876,8 @@
         for change, l in iter:
             fm.startitem()
             fm.context(ctx=ctx)
-            fm.data(node=fm.hexfunc(scmutil.binnode(ctx)))
-            fm.write('path', '%s', fn, label='grep.filename')
+            fm.data(node=fm.hexfunc(scmutil.binnode(ctx)), path=fn)
+            fm.plain(uipathfn(fn), label='grep.filename')
 
             cols = [
                 ('rev', '%d', rev, not plaingrep),