Cancelling the Google sign-in sheet shows an error dialog with the raw exception message as button text (expected AuthState.Cancelled, no dialog)

[joknu1]

Environment

• FirebaseUI version: com.firebaseui:firebase-ui-auth:10.0.0-beta03 (Compose FirebaseAuthScreen)
• Device: OnePlus 10 Pro (NE2213), Android 16 (API 36)
• Google Play services: 26.26.34

Steps to reproduce

1. Configure FirebaseAuthScreen with a Google provider:

FirebaseAuthScreen(
    configuration = authUIConfiguration {
        this.context = context
        isCredentialManagerEnabled = false
        isMfaEnabled = false
        providers {
            provider(AuthProvider.Google(scopes = emptyList(), serverClientId = webClientId))
            provider(AuthProvider.Facebook())
            provider(AuthProvider.Email(emailLinkActionCodeSettings = null, passwordValidationRules = emptyList()))
        }
    },
    onSignInSuccess = { ... },
    onSignInFailure = { ... },
    onSignInCancelled = { ... },
)

2. Tap "Sign in with Google".
3. Dismiss the Credential Manager account sheet (swipe back / tap outside).

Observed

An "Authentication Error" dialog appears:

• Message: "Authentication was cancelled. Please try again when ready."
• Confirm button labeled "User cancelled the selector" — the raw
  GetCredentialCancellationException message rendered as button text.
• onSignInCancelled is never invoked.

Expected

Cancelling a sign-in is a normal user action, not an error. Expected the flow to return
to the method picker silently, with onSignInCancelled invoked — i.e. the existing
AuthState.Cancelled path, which already does exactly this and shows no dialog.

Analysis

Two separate problems compound here:

1. Cancellation is routed to the error state. In
   GoogleAuthProvider+FirebaseAuthUI.kt (~line 217), the CancellationException from the
   credential flow is caught and re-emitted as updateAuthState(AuthState.Error(AuthCancelledException(...)))
   rather than AuthState.Cancelled. The top-level dialog controller in FirebaseAuthScreen
   then unconditionally shows ErrorRecoveryDialog for any AuthState.Error.

2. The raw exception message is used as the button label. In ErrorRecoveryDialog.kt,
   getRecoveryActionText() maps AuthCancelledException -> error.message ?: stringProvider.continueText,
   so whatever message the underlying exception carries ("User cancelled the selector")
   becomes the confirm-button text. Even for genuine error cases this should presumably be
   stringProvider.continueText (or another localized action label), never error.message.

Suggested fix: emit AuthState.Cancelled for user-initiated cancellations in the Google
provider (matching the documented behavior of AuthCancelledException: "thrown when the
user cancels an authentication flow"), and stop using error.message as an action label in
ErrorRecoveryDialog.

[russellwheatley]

Hi @joknu1 - thank you for raising this issue, we'll get this looked at 🙏