Feature Request: OAuth2 support for sending in state for Authorization Code flow

[werge2121]

I have checked the following:

• I've searched existing issues and found nothing related to my issue.

Describe the feature you want to add

Our OAuth2 provider requires a state param to be sent in. With the current implementation of Authorization Code we get back an error stating "The authentication request has an invalid 'state' parameter." A textbox under scope where we can enter the state param would be nice like other oauth clients.

Mockups or Images of the feature

[pietrygamat]

Implemented in #2114

[pietrygamat]

@werge2121 can we reopen this? It's important feature, but still not merged.