WebAuthenticator does not extract parameters contained in a fragment (regression)

[rdavisau]

Description

This test doesn't pass any more (case when parameters are contained in a fragment);

maui/src/Essentials/test/DeviceTests/Tests/WebAuthenticator_Tests.cs

Line 60 in 9b091fd

[InlineData("xamarinessentials://#access_token=blah&refresh_token=blah2&expires=1", "blah", "blah2", "1")]

Introduced by #15245, which changes parameter extraction to happen off of Uri.Query (seems fragment parameters are found in Uri.Fragment)
edeae34#diff-686959c852a62a0b284d6cf92e5b61a6871108fbfc177d8ef9be7ccc94fbc2dfR18

This prevents successful authentication when callback parameters are returned in a fragment.

Steps to Reproduce

Run the WebAuthenticator ParseQueryString tests

Link to public reproduction project repository

https://github.com/dotnet/maui/

Version with bug

8.0.0-preview.5.8529

Last version that worked well

8.0.0-preview.4.8333

Affected platforms

iOS, Android, Windows, macOS, Other (Tizen, Linux, etc. not supported by Microsoft directly)

Affected platform versions

all

Did you find any workaround?

User can extract any required parameters from WebAuthenticatorResult.CallbackUri manually

Relevant log output

No response

[jstedfast]

The URI in the test should probably be fixed:

[InlineData("xamarinessentials://?refresh_token=blah2&expires=1#access_token=blah", "blah", "blah2", "1")]

Or does our code generate these types of URIs where the fragment is assumed to be allowed to contain query parameters?