Maintain which lists a record exists on when record merged (and is deleted source record)
When merging records when one or both records exist in List Management, if the record deleted is the record in a list, the record gets removed from the list. All list assignments in List Management should be maintained when merging records regardless which direction the merge occurs.

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Joshua commented
Yes this would be really helpful and could fix some issues!
One of the duplicate records could be in a specific List Management List. After we merge the records using the Raiser's Edge merge function, the surviving record is not in the List Management List anymore. This can cause real problems if one of our Executive Directors would like all the names from a specific List Management (LM) List exported. Names that were merged with duplicates might not be listed on this LM List anymore, and the Executive would not receive a complete list and would miss those constituents. This could cause some problems. Please fix!