I just discovered that component instances can be glued to groups.
The chair component in this image is set to glue to horizontal. The box is a group.
Each instance was added and glued “to face in group” at a point in time when there was a horizontal face in the group at each instance location. The instances are NOT in the group.
Subsequent edits of the group deleted or moved the faces that each chair was originally glued to.
Yet each chair is still glued to the group: If I move the group, the chairs move.
Each chair insertion point is actually glued at an xyz coordinate relative to the group’s origin.
If the group is scaled the chair positions move but the chairs themselves are not scaled.
The only downside is that component instances glued to groups cannot cut openings.
This behavior is actually quite useful. Is it documented anywhere?
(It would also be nice if groups could be glued to other groups.)