--- a/mercurial/changelog.py	Thu Apr 18 13:35:02 2019 -0700
+++ b/mercurial/changelog.py	Tue May 14 22:19:51 2019 -0700
@@ -99,6 +99,14 @@
         # used different syntax for the value.
         return None
 
+def encodefileindices(files, subset):
+    subset = set(subset)
+    indices = []
+    for i, f in enumerate(files):
+        if f in subset:
+            indices.append('%d' % i)
+    return '\0'.join(indices)
+
 def stripdesc(desc):
     """strip trailing whitespace and leading and trailing empty lines"""
     return '\n'.join([l.rstrip() for l in desc.splitlines()]).strip('\n')
@@ -564,7 +572,8 @@
         return l[3:]
 
     def add(self, manifest, files, desc, transaction, p1, p2,
-                  user, date=None, extra=None, p1copies=None, p2copies=None):
+                  user, date=None, extra=None, p1copies=None, p2copies=None,
+                  filesadded=None, filesremoved=None):
         # Convert to UTF-8 encoded bytestrings as the very first
         # thing: calling any method on a localstr object will turn it
         # into a str object and the cached UTF-8 string is thus lost.
@@ -593,17 +602,23 @@
             elif branch in (".", "null", "tip"):
                 raise error.StorageError(_('the name \'%s\' is reserved')
                                          % branch)
-        if (p1copies is not None or p2copies is not None) and extra is None:
+        extrasentries = p1copies, p2copies, filesadded, filesremoved
+        if extra is None and any(x is not None for x in extrasentries):
             extra = {}
         if p1copies is not None:
             extra['p1copies'] = encodecopies(p1copies)
         if p2copies is not None:
             extra['p2copies'] = encodecopies(p2copies)
+        sortedfiles = sorted(files)
+        if filesadded is not None:
+            extra['filesadded'] = encodefileindices(sortedfiles, filesadded)
+        if filesremoved is not None:
+            extra['filesremoved'] = encodefileindices(sortedfiles, filesremoved)
 
         if extra:
             extra = encodeextra(extra)
             parseddate = "%s %s" % (parseddate, extra)
-        l = [hex(manifest), user, parseddate] + sorted(files) + ["", desc]
+        l = [hex(manifest), user, parseddate] + sortedfiles + ["", desc]
         text = "\n".join(l)
         return self.addrevision(text, transaction, len(self), p1, p2)
 

--- a/mercurial/localrepo.py	Thu Apr 18 13:35:02 2019 -0700
+++ b/mercurial/localrepo.py	Tue May 14 22:19:51 2019 -0700
@@ -2589,10 +2589,13 @@
 
         writecopiesto = self.ui.config('experimental', 'copies.write-to')
         writefilecopymeta = writecopiesto != 'changeset-only'
+        writechangesetcopy = (writecopiesto in
+                              ('changeset-only', 'compatibility'))
         p1copies, p2copies = None, None
-        if writecopiesto in ('changeset-only', 'compatibility'):
+        if writechangesetcopy:
             p1copies = ctx.p1copies()
             p2copies = ctx.p2copies()
+        filesadded, filesremoved = None, None
         with self.lock(), self.transaction("commit") as tr:
             trp = weakref.proxy(tr)
 
@@ -2601,6 +2604,9 @@
                 self.ui.debug('reusing known manifest\n')
                 mn = ctx.manifestnode()
                 files = ctx.files()
+                if writechangesetcopy:
+                    filesadded = ctx.filesadded()
+                    filesremoved = ctx.filesremoved()
             elif ctx.files():
                 m1ctx = p1.manifestctx()
                 m2ctx = p2.manifestctx()
@@ -2667,6 +2673,11 @@
                     mn = mctx.write(trp, linkrev,
                                     p1.manifestnode(), p2.manifestnode(),
                                     added, drop, match=self.narrowmatch())
+
+                    if writechangesetcopy:
+                        filesadded = [f for f in changed
+                                      if not (f in m1 or f in m2)]
+                        filesremoved = removed
                 else:
                     self.ui.debug('reusing manifest from p1 (listed files '
                                   'actually unchanged)\n')
@@ -2683,6 +2694,8 @@
                 # filelogs.
                 p1copies = p1copies or None
                 p2copies = p2copies or None
+                filesadded = filesadded or None
+                filesremoved = filesremoved or None
 
             # update changelog
             self.ui.note(_("committing changelog\n"))
@@ -2690,7 +2703,7 @@
             n = self.changelog.add(mn, files, ctx.description(),
                                    trp, p1.node(), p2.node(),
                                    user, ctx.date(), ctx.extra().copy(),
-                                   p1copies, p2copies)
+                                   p1copies, p2copies, filesadded, filesremoved)
             xp1, xp2 = p1.hex(), p2 and p2.hex() or ''
             self.hook('pretxncommit', throw=True, node=hex(n), parent1=xp1,
                       parent2=xp2)

--- a/tests/test-copies-in-changeset.t	Thu Apr 18 13:35:02 2019 -0700
+++ b/tests/test-copies-in-changeset.t	Tue May 14 22:19:51 2019 -0700
@@ -5,6 +5,7 @@
   > copies.read-from=changeset-only
   > [alias]
   > changesetcopies = log -r . -T 'files: {files}
+  >   {extras % "{ifcontains("files", key, "{key}: {value}\n")}"}
   >   {extras % "{ifcontains("copies", key, "{key}: {value}\n")}"}'
   > showcopies = log -r . -T '{file_copies % "{source} -> {name}\n"}'
   > [extensions]
@@ -24,6 +25,8 @@
   $ hg ci -m 'copy a to b, c, and d'
   $ hg changesetcopies
   files: b c d
+  filesadded: 0\x001\x002 (esc)
+  
   p1copies: b\x00a (esc)
   c\x00a (esc)
   d\x00a (esc)
@@ -43,6 +46,9 @@
   $ hg ci -m 'rename b to b2'
   $ hg changesetcopies
   files: b b2
+  filesadded: 1
+  filesremoved: 0
+  
   p1copies: b2\x00b (esc)
   $ hg showcopies
   b -> b2
@@ -60,6 +66,7 @@
   $ hg ci -m 'move b onto d'
   $ hg changesetcopies
   files: c
+  
   p1copies: c\x00b2 (esc)
   $ hg showcopies
   b2 -> c
@@ -88,6 +95,8 @@
   $ hg ci -m 'merge'
   $ hg changesetcopies
   files: g h i
+  filesadded: 0\x001\x002 (esc)
+  
   p1copies: g\x00a (esc)
   i\x00f (esc)
   p2copies: h\x00d (esc)
@@ -102,6 +111,9 @@
   $ hg ci -m 'copy a to j' --config experimental.copies.write-to=compatibility
   $ hg changesetcopies
   files: j
+  filesadded: 0
+  filesremoved: 
+  
   p1copies: j\x00a (esc)
   p2copies: 
   $ hg debugdata j 0
@@ -122,6 +134,9 @@
   $ hg ci -m 'modify j' --config experimental.copies.write-to=compatibility
   $ hg changesetcopies
   files: j
+  filesadded: 
+  filesremoved: 
+  
   p1copies: 
   p2copies: 
 
@@ -131,6 +146,7 @@
   $ hg ci -m 'copy a to k' --config experimental.copies.write-to=filelog-only
   $ hg changesetcopies
   files: k
+  
   $ hg debugdata k 0
   \x01 (esc)
   copy: a
@@ -157,9 +173,9 @@
   $ hg mv a b
   $ hg ci -qm 'rename a to b'
   $ hg rebase -d 1 --config rebase.experimental.inmemory=yes
-  rebasing 2:55d0b405c1b2 "rename a to b" (tip)
+  rebasing 2:acfc33f3aa6d "rename a to b" (tip)
   merging a and b to b
-  saved backup bundle to $TESTTMP/rebase-rename/.hg/strip-backup/55d0b405c1b2-78df867e-rebase.hg
+  saved backup bundle to $TESTTMP/rebase-rename/.hg/strip-backup/acfc33f3aa6d-81d0180d-rebase.hg
   $ hg st --change . --copies
   A b
     a

--- a/tests/test-copies.t	Thu Apr 18 13:35:02 2019 -0700
+++ b/tests/test-copies.t	Tue May 14 22:19:51 2019 -0700
@@ -551,14 +551,15 @@
 
   $ hg up 2 -q
   $ hg graft -r 4 --base 3 --hidden
-  grafting 4:af28412ec03c "added d, modified b" (tip)
+  grafting 4:af28412ec03c "added d, modified b" (tip) (no-changeset !)
+  grafting 4:6325ca0b7a1c "added d, modified b" (tip) (changeset !)
   merging b1 and b to b1
 
   $ hg l -l1 -p
   @  5 added d, modified b
   |  b1
   ~  diff -r 5a4825cc2926 -r 94a2f1a0e8e2 b1 (no-changeset !)
-  ~  diff -r f5474f5023a8 -r ef7c02d69f3d b1 (changeset !)
+  ~  diff -r df722b7fe2d5 -r ba3ddbbdfd96 b1 (changeset !)
      --- a/b1	Thu Jan 01 00:00:00 1970 +0000
      +++ b/b1	Thu Jan 01 00:00:00 1970 +0000
      @@ -1,1 +1,2 @@
@@ -618,7 +619,8 @@
      a
 
   $ hg rebase -r . -d 2 -t :other
-  rebasing 5:5018b1509e94 "added willconflict and d" (tip)
+  rebasing 5:5018b1509e94 "added willconflict and d" (tip) (no-changeset !)
+  rebasing 5:619047c26bf8 "added willconflict and d" (tip) (changeset !)
 
   $ hg up 3 -q
   $ hg l --hidden
@@ -641,4 +643,5 @@
 neither of the merging csets will be a descendant of the base revision:
 
   $ hg graft -r 6 --base 4 --hidden -t :other
-  grafting 6:99802e4f1e46 "added willconflict and d" (tip)
+  grafting 6:99802e4f1e46 "added willconflict and d" (tip) (no-changeset !)
+  grafting 6:9ddc6fb3b691 "added willconflict and d" (tip) (changeset !)