If too many element selections are changed even while the older element's O.o() listeners are removed, or while object-tree is being populated, unexpected things may happen.

[sachinhosmani]

It may take some time to load an object and a model object into the object-trees.
So it makes sense to have a state that prevents further element selections while this happens. Maybe it could look at pending selections after it finishes dealing with the current one.
(like how it is done with DOM mutations now)

[sachinhosmani]

Applicable especially with quick element selections made in inspector with keyboard.