(splitting from MBS-3950)

When a merge recordings edit is pending, we can control many information such as name, artist credit, ISRC and length.

	Name	Artist	ISRCs	Length
Merge:	襟裳岬	森進一	JPVI07301690	4:21
Into:	襟裳岬	森進一	JPVI07301690	4:21

But once the edit has passed, the information of disappeared recordings is not retained, only its name.

	Name	Artist	ISRCs	Length
Merge:	襟裳岬
Into:	襟裳岬	森進一	JPVI07301690	4:21

It would be interesting when we try to diagnose possible mistakes in edit histories to have those information preserved.