Enable handling users closing login popup

[adiessl]

I noticed there is no way of getting notified when a user closes the login popup. The registered event handler in the main window also does not get removed in this case. This PR solves these issues.

Open questions to discuss:

• Is it problematic if accessToken and userData are undefined in LoginResult?
• Should an errorMessage property be added to LoginResult?

  {
    isAuthenticated: false,
    errorMessage: "User closed popup"
  }

[FabianGosebrink]

Hey @adiessl, that is a nice fix, implemented in a good and clean way. I like it! Nice work, really well done.

Concerning your questions:

Is it problematic if accessToken and userData are undefined in LoginResult?

Currently the popup login method is the only one returning those properties, IMHO it is not problematic having those to be undefined, becase the user closed.

Should an errorMessage property be added to LoginResult?

IMHO this would be a nice improvement to be clear and transparent what happened. Would you like to add it?

[adiessl]

Sure, I'll add the errorMessage.

[damienbod]

LGTM thanks! will be released in 11.6.7