Undo not working in browser devtools inspector

[dmarcos]

Open chrome dev tools. In the inspector one can click and remove an entity but undo (ctrl/cmd - z) doesn't restore the entity.

[mrxz]

The dev tools inspector doesn't simply re-introduce the HTML, but actually (re)attaches the original element instance. This isn't supported by A-Frame, see #2425 (and related #4701, #4133, #4316, #4604, #3885).

While we could try to support a limited form of re-attaching (not re-parenting), that just shifts the problem to dragging not working in browser dev tools. The A-Frame inspector exists for this exact purpose. One option could be to better detect any re-attaching/re-parenting and logging an appropriate error in the console. That way it should at least clue users in that it isn't supported.