Summary:
UITextView is accessible by default (some nested views are) and disabling that is not supported.
The problem happened because JS side sets `isAccessible` flag for UITextView and UITextField to `true` (with good intent!), which actually disables (surprise!) bult-in accessibility of TextInput on iOS.
On iOS accessible elements cannot be nested, so enabling accessibily for some container view (even in a case where this is view is a public API of TextInput on iOS) shadows some features implemented inside the component.
(Disabling accessibility of TextInput via `accessible=false` was never supported.)
Reviewed By: JoshuaGross
Differential Revision: D15280667
fbshipit-source-id: 72509b40383db6ef66c4263bd920f5ee56a42fc1