Gravatar: Disable the email input for Gravatar-powered clients (#94172)

client/blocks/login/index.jsx

@@ -155,13 +155,26 @@ class Login extends Component {
 			this.props.requestError?.field === 'usernameOrEmail' &&
 			this.props.requestError?.code === 'email_login_not_allowed'
 		) {
-			const magicLoginUrl = login( {
+			let urlConfig = {
 				locale: this.props.locale,
 				twoFactorAuthType: 'link',
 				oauth2ClientId: this.props.currentQuery?.client_id,
 				redirectTo: this.props.redirectTo,
 				usernameOnly: true,
-			} );
+			};
+
+			if ( this.props.isGravPoweredClient ) {
+				urlConfig = {
+					...urlConfig,
+					gravatarFrom:
+						isGravatarOAuth2Client( this.props.oauth2Client ) &&
+						this.props.currentQuery?.gravatar_from,
+					gravatarFlow: isGravatarFlowOAuth2Client( this.props.oauth2Client ),
+					emailAddress: this.props.currentQuery?.email_address,
+				};
+			}
+
+			const magicLoginUrl = login( urlConfig );
 
 			page( magicLoginUrl );
 		}