Confirmation dialog (onbeforeunload) displayed after popped from webview page

[AlexV525]

Environment

Flutter version: 1.17.0 (stable)
Plugin version: 3.1.0
Android version: Android 10

Description

This issue will occur if a web page is using onbeforeunload to control page reload or close. An example would be onbeforeunload .

Expected behavior: Closing a webView without any confirmation, or prevent pop before confirmed/cancelled.

Current behavior: A dialog shown after popped.

Steps to reproduce

1. Visit onbeforeunload
2. Pop the webview page. e.g. using Navigator.pop(context).
3. A dialog displayed. (If not, click "navigate" or "goto" link)

Images

A dialog shown after the webview has been popped.

[AlexV525]

And it's not localized too.

[pichillilorenzo]

Fixed! Instead, I think the localization depends on the language you set on the smartphone. For example, I see the same message but In Italian on my smartphone.