History change lines are hard to compare as some of them are in reverse order

`resolution_fixed` `type_defect`   |    by kivinen@iki.fi

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When changing list of members in the group (secdir in this case) the history show that 

Reviewers changed to <list in alphabetical order> from <list in reverse alphabetical order>

It would be nice to have both lists in alphabetical order. 

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_Issue migrated from trac:2560 at 2022-03-04 06:49:31 +0000_