Id: Object modified if it is added to and then removed from a relation

[naoliv]

It seems that somehow iD set this relation https://www.openstreetmap.org/relation/3359493 (at https://www.openstreetmap.org/changeset/64125080) as modified even though nothing was changed on it.

Nothing can be seen at http://osm.mapki.com/history/relation.php?id=3359493, https://osmlab.github.io/osm-deep-history/#/relation/3359493 or JOSM's history, for example (no tags or members were modified).

Reverting this changeset also doesn't modify the relation (which also corroborates that it was unnecessarily set as modified)

Trying to do a quick test I wasn't able to reproduce this, but maybe there is some corner case in the code that caused this.

[smaprs]

The problem I see with this issue is that if for any reason iD inadvertedly modifies the version of an objetct even if there's no actual change in it, the confidence in objects stability for any retrieving purpose is lost. It may led to a mess in QA when expecting to distinguish between modified & non modified objects. Thank you naoliv.

[hikemaniac]

This happens when adding a member to a relation and deleting it. When the member is removed again and the relation returns to its original status, iD will report it as changed anyway.

[naoliv]

Yep, I can confirm that it's reproducible in this way.
@bhousel remove the bug-cant-reproduce tag? :-)