public static function user_role_bulk_dropdown( $which ) {

		// Remove the bottom list table "change forum role" dropdown from WordPress < 4.6.
		// See https://bbpress.trac.wordpress.org/ticket/2906.
		if ( bbp_get_major_wp_version() < 4.6 ) {
			remove_action( 'restrict_manage_users', array( __CLASS__, 'user_role_bulk_dropdown' ) );
		}

		// Bail if current user cannot promote users
		if ( ! current_user_can( 'promote_users' ) ) {
			return;
		}

		// Get the roles
		$dynamic_roles = bbp_get_dynamic_roles();

		// Only keymasters can set other keymasters
		if ( ! bbp_is_user_keymaster() ) {
			unset( $dynamic_roles[ bbp_get_keymaster_role() ] );
		}

		$select_id = 'bottom' === $which ? 'bbp-new-role2' : 'bbp-new-role';
		$button_id = 'bottom' === $which ? 'bbp-change-role2' : 'bbp-change-role';
		?>

		<label class="screen-reader-text" for="<?php echo $select_id; ?>"><?php esc_html_e( 'Change forum role to&hellip;', 'bbpress' ) ?></label>
		<select name="<?php echo $select_id; ?>" id="<?php echo $select_id; ?>" style="display:inline-block; float:none;">
			<option value=''><?php esc_html_e( 'Change forum role to&hellip;', 'bbpress' ) ?></option>
			<?php foreach ( $dynamic_roles as $role => $details ) : ?>
				<option value="<?php echo esc_attr( $role ); ?>"><?php echo bbp_translate_user_role( $details['name'] ); ?></option>
			<?php endforeach; ?>
		</select><?php submit_button( esc_html__( 'Change', 'bbpress' ), 'secondary', $button_id, false );

		wp_nonce_field( 'bbp-bulk-users', 'bbp-bulk-users-nonce' );
	}