# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@octobus.net>
# Date 1709913128 -3600
# Node ID 18c2753434f2ab58d1cf51bf1934efabf48339da
# Parent  659f766629c8ed9c6e202060cd134fb5af3961b3
branchcache: explicitly assert that copy is always about inheritance

This would catch cases where copy is used for something else if any existed.

diff -r 659f766629c8 -r 18c2753434f2 mercurial/branchmap.py
--- a/mercurial/branchmap.py	Sat Mar 09 02:07:15 2024 +0100
+++ b/mercurial/branchmap.py	Fri Mar 08 16:52:08 2024 +0100
@@ -556,6 +556,7 @@
 
     def copy(self, repo):
         """return a deep copy of the branchcache object"""
+        assert repo.filtername != self._filtername
         other = type(self)(
             repo=repo,
             # we always do a shally copy of self._entries, and the values is