See b/151307855

Observe that when using TextField or TextFormField in Flutter on iOS platform, if users Single-Tap a non-empty, TextField (the text field is not in an active/editing state) under VoiceOver mode, it will read out 'empty line'.

Steps to reproduce:

Turn on VoiceOver
Navigate to a screen that has a TextField or TextFormField

case 1: Navigate to the TextField using swipe gestures, it voice out

• Text field, is editing, <content>

case 2: Single-Tap on TextField directly, it voice out

• Text field, empty line