BuddyPress Nouveau Template - Change username to name in messages interface

bp-username-to-name-messages.php

<?php
add_action( 'wp_ajax_messages_get_user_message_threads', 'stax_bpb_change_messages_username', 9 );
function stax_bpb_change_messages_username() {
	add_filter('bp_core_get_username', function( $name ) {
		$user = get_user_by('login', $name);
		if ($user) {
			$name = $user->display_name;
		}
		return $name;
	});
}