Quick edit clearing the meta data of registered metaboxes

[rafasashi]

Since "Quick Edit" triggers the save_post hook the following function might end up clearing the meta data of registered metaboxes that are not included in the Quick Edit form:

WordPress-Plugin-Template/includes/lib/class-wordpress-plugin-template-admin-api.php

Line 341 in 27d7286

$fields = apply_filters( $post_type . '_custom_fields', array(), $post_type );

This issue is referenced here:

https://wordpress.stackexchange.com/questions/4931/quick-edit-update-clears-out-my-custom-meta-values

I suggest replacing

if( !$post_id )

by

if( !$post_id || isset($_POST['_inline_edit']) )