Group nesting not working

[macintoshhelper]

This is more an issue with Adobe XD, but group nesting is broken. This is blocking development on the View component system, which is an integral part of this repo.

The Adobe XD scenegraph doesn't let you create a new group with children, but requires you to add the children to the document root, select them with commands, then create a group, but this doesn't appear to work when one of the children is a group.

I'd love to know if this is just a limitation in the Adobe XD platform API, or if there is a way around this.