The focus of the a11y is losing state after popped from pages.

Summary

When we're using talkback in native Android applications, jump to a new page and return, and the focus of talkback will remain the previous focus.
For example, when there are three buttons on the home page, click the second button to jump to another page. Then I press the back button to return to the previous page. The primary focus will be on the second button.

On the flutter, I found that after returning to the previous page, the focus was on the first button. It doesn't focus on the previous position, that is, the second button, like the native Android.

This should be because the flutter does not have the correct accessibility event notification, so the talkback cannot determine the position of the previous focus.

Environment

• Flutter (Channel beta, 2.7.0-3.1.pre)
• Talkback 9.1
• Android 9.0