This property is added as needed in our legacy SpacePen views, and is
now used to trigger a deprecation warning. We don’t want to add it to
new SpacePen views because they shouldn’t trigger deprecation warnings.
It now takes two arguments, a model constructor and a create view
callback that is passed the model.
Signed-off-by: Max Brunsfeld <maxbrunsfeld@gmail.com>
If present, it will be called with the model object instead of
instantiating the view constructor directly and assigning a model on it.
This gives users more flexibility when constructing views.
It’s a more technically correct term. You use a class keyword to declare
these things, but the actual objects you pass around to talk about them
are constructor functions.
