# HG changeset patch
# User Thierry Florac <thierry.florac@onf.fr>
# Date 1561472709 -7200
# Node ID 10f770095ceca29252bff5565b8224cb1a75d276
# Parent  b602a92324eb2f20c4f612f8d7b295c05025fde9
Don't update contributors "in place" but use and update a copy of attribute

diff -r b602a92324eb -r 10f770095cec src/pyams_content/shared/common/zmi/owner.py
--- a/src/pyams_content/shared/common/zmi/owner.py	Tue May 28 14:35:20 2019 +0200
+++ b/src/pyams_content/shared/common/zmi/owner.py	Tue Jun 25 16:25:09 2019 +0200
@@ -103,7 +103,7 @@
             roles = IWfSharedContentRoles(version)
             previous_owner = next(iter(roles.owner))
             roles.owner = {new_owner}
-            contributors = roles.contributors
+            contributors = roles.contributors.copy()  # don't modify contributors in place!!
             if data.get('keep_owner_as_contributor'):
                 if previous_owner not in contributors:
                     contributors.add(previous_owner)