Await on auth initialization before signing in with redirect.

Author: prameshj

packages/auth/src/platform_browser/strategies/redirect.ts

@@ -91,6 +91,8 @@ export async function _signInWithRedirect(
 ): Promise<void | never> {
   const authInternal = _castAuth(auth);
   _assertInstanceOf(auth, provider, FederatedAuthProvider);
+  // Wait for auth initialization to complete, this will process pending redirects and clear session storage.
+  await authInternal._initializationPromise;
   const resolverInternal = _withDefaultResolver(authInternal, resolver);
   await _setPendingRedirectStatus(resolverInternal, authInternal);