TextField(
   enabled: false,
),

On Android with TalkBack enabled this should be announced as a disabled editbox. It is currently not announced at all. (It looks like the TextField flag is missing from the semantics tree when the TextField is disabled).

I haven't tested on iOS (and I am not 100% of what the native behavior is there), but I assume it's also broken there.

/cc @dnfield for a11y
/cc @chunhtai @justinmc for TextFields