WordPress at a glance
filter is not described

title_save_pre filter-hook . WP 1.0

This filter is documented in wp-includes/post.php

Usage

add_filter( 'title_save_pre', 'filter_function_name_9024' );
function filter_function_name_9024( $wp_slash ){
	// filter...

	return $wp_slash;
}
$wp_slash
-

Where the hook is called

WP_Customize_Nav_Menu_Item_Setting::sanitize()
title_save_pre
wp-includes/customize/class-wp-customize-nav-menu-item-setting.php 711
$menu_item_value['title'] = wp_unslash( apply_filters( 'title_save_pre', wp_slash( $menu_item_value['title'] ) ) );

Where in WP core the hook is used WordPress

wp-includes/customize/class-wp-customize-nav-menu-item-setting.php 2083
add_filter( 'title_save_pre', 'wp_filter_kses' );
wp-includes/customize/class-wp-customize-nav-menu-item-setting.php 2112
remove_filter( 'title_save_pre', 'wp_filter_kses' );