Sorry, I haven't had time to look into the bug or your proposed fix, and I'm going away for 2 weeks. Hopefully others can take a look at it soon.

Just wanted to let you know that this wasn't lost to the abyss.

Raphaël

On 9/26/21 10:31 PM, alexrayne wrote:
# HG changeset patch
# User alexrayne <alexraynepe...@gmail.com>
# Date 1632687562 -10800
#      Sun Sep 26 23:19:22 2021 +0300
# Branch stable
# Node ID f626e7866c6ccee998543847f7ed3b0f63a3c504
# Parent  bf4231a64fb22e0268aea344f03fbab1708ca3a5
issue6588 fix: filelog can store rev-dups - revs with same content on same 
parents, but on different changeID.

* to solve problem with rev-dups, this patch infers changes into revision 
meta-data - current timestamp.

diff --git a/mercurial/filelog.py b/mercurial/filelog.py
--- a/mercurial/filelog.py
+++ b/mercurial/filelog.py
@@ -18,6 +18,7 @@
      util as interfaceutil,
  )
  from .utils import storageutil
+from .utils import dateutil
  from .revlogutils import (
      constants as revlog_constants,
      rewrite,
@@ -209,8 +210,14 @@
def add(self, text, meta, transaction, link, p1=None, p2=None):
          if meta or text.startswith(b'\1\n'):
-            text = storageutil.packmeta(meta, text)
-        rev = self.addrevision(text, transaction, link, p1, p2)
+            revdata = storageutil.packmeta(meta, text)
+        else :
+            revdata = text
+        rev = self.addrevision(revdata, transaction, link, p1, p2)
+        if self.linkrev(rev) != link:
+            meta[b"dup-date"] = dateutil.datestr()
+            revdata = storageutil.packmeta(meta, text)
+            rev = self.addrevision(revdata, transaction, link, p1, p2)
          return self.node(rev)
def renamed(self, node):

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