Allow subclasses of RB.CollectionView to specify the item container element.
Review Request #10740 — Created Oct. 2, 2019 and submitted
RB.CollectionViewmakes automatic rendering of items from a collection
easy, but it has a limitation in that all items render to the
collection's main element. This prevents subclasses from having a more
complex element tree.
RB.CollectionViewto introduce a new
attribute, which is used for all rendering. It defauls to
subclasses or consumers can override it to point to another element in
Unit tests passed.
Successfully used this new attribute in an upcoming change.