django32: RuntimeError: dictionary changed size during iteration

[Akihiro Motoki]

trove-dashboard UT with Django 3.2 (and horizon master latest) fails with "RuntimeError: dictionary changed size during iteration"

Detail: https://paste.opendev.org/show/809491/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/horizon/+/810388

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/horizon/+/810388
Committed: https://opendev.org/openstack/horizon/commit/a20c4f6f2218255597c719aa7505295f689abf9a
Submitter: "Zuul (22348)"
Branch: master

commit a20c4f6f2218255597c719aa7505295f689abf9a
Author: Akihiro Motoki <email address hidden>
Date: Wed Sep 22 19:37:44 2021 +0900

    workflow: Do not touch dict during iteration

    Django 3.2 stored the field information as dict instead OrderedDict
    because python 3.7+ ensure the field order of dict as the language spec.
    We cannot touch dict itself during iteration. We need to pass a list
    instead of a value from .items() itself to avoid the error.

    Change-Id: Ie22865995d14fa60c16cf2cea582aa0eec46b65d
    Closes-Bug: #1944548

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/horizon 20.1.0 release.