mx.controls.TextArea does not handle htmlText getter/setter

setting htmlText does not work. (getting and setting causes errors with coercion to HTMLInputElement).

Also setting innerHTML does not seem to be a viable option for native , so supporting this in the emulation version (assuming that sanitizer is also used) seems like it might need something else (contenteditable ?)

Start at mx.controls.TextArea and inspect the htmlText getter/setter behavior, including the coercion errors reported for HTMLInputElement. Compare that with native textarea handling of innerHTML and the mention of contenteditable and the sanitizer. Done should mean htmlText no longer errors and its emulation behavior is defined.

Written by the indexing model from the issue text.