Booklet view failures on classical albums

[simoncn]

A MinimServer Group is sent to the control point as an album because many control points have special treatment for how albums are presented as well as providing an option to play all tracks of an album with a single action.

The tracks in the group have upnp:album set to the group name because this is the sub-album (as described in the UPnP specification) to which these tracks belong. This is the "album name" that should be shown by the control point when each track in the group is playing. This is important for classical music where tracks are movements of a work and the track is titled (for example) '2: Allemande' with a group title of 'Handel: Suite No 1 in A major.'

This "group album" has an upnp:album tag which is currently set to the same value as the dc:title tag for this "group album." I think this is wrong and should instead be set to the top-level album containing the group. Making this change should enable the control point to get the top-level album name (if needed) by following a chain from track item to group container to album container.

Would this change to MinimServer enable BubbleUPnP to find the correct local booklet filename in this situation? I understand that a change to BubbleUPnP would be needed because the top-level album name would still not appear directly on the track item.