fix(material/list): Selection List element should not be focusable.#18445

Merged

mmalerba merged 2 commits intoangular:masterfrom zelliott:list-focus

Feb 11, 2020

+117-64

Commits on Feb 9, 2020

fix(material/list): Selection list element should not take focus. Focus should move to previously active option.
zelliott
committed
Nit changes to a few comments and accept API goldens.
zelliott
committed