Autofill password field not triggering on (Android devices) for Flutter

Hi @peri!

Thanks for working on this! I also tested it with my example app (https://github.com/ricardoboss/flutter_password_autofill ) and it now kinda works with the latest beta of 1Password.

When I first launched the app, my keyboard shows the "Open 1Password" button, so I think it recognized that I put the cursor in a username field.

I then tried entering some credentials and submitted them. Unfortunately, 1Password didn't receive the event or sth like that because it didn't ask me if I want to save my credentials.

Anyway, after entering the app with a fresh session, I created a new login from within the 1Password dialog for the app and let it autofill the inputs, which worked as it should. Nice!

Then, after restarting the app again, 1Password showed the "Open 1Password" button and a button for the credentials I just created above the keyboard, but only autofilled the password field when I tapped on it. Also, focussing the username input now doesn't trigger the 1Password prompt to autofill anymore.

So, in short:
1. no prompt to save credentials after form submission
2. autofill works when creating the login within the app
3. autofill doesn't work for username after restarting the app
4. username field doesn't trigger "Open 1Password" bar

I hope this helps! As I said, I am using the repository I linked above to test the behaviour. Maybe you can tell me how to improve my implementation. Am I missing some tags/labels on the inputs?