wp_insert_post_data should include $update

[nhadsall]

wp_insert_post() has a great filter: 'wp_insert_post_data', but it doesn't contain the status of $update (if the post is being updated or new). So, our options are 1. check again if this is an update (redundant) or 2. wait for the 'save_post' action and resave the post with changes (making redundant DB calls). So, it seems the best solution is 3. simply add $update as a parameter to wp_insert_post_data.

[mukesh27]

Patch.

[mukesh27]

Hi @nhadsall, Welcome to WordPress Trac! Thank you for your ticket.

+1 on your thought as it's great to add $update variable in filter.

[SergeyBiryukov]

In 52691:

Posts, Post Types: Pass the $update parameter to wp_insert_post_data and wp_insert_attachment_data filters.

This makes it easier to determine in a callback function whether this is an existing post being updated or not.

Follow-up to [8635], [8702], [27130], [27138], [28106], [28788], [47633].

Props nhadsall, mukesh27.
Fixes #46228.

[milana_cap]

Marking for dev note just to be mentioned in Field guide, rather than having dedicated dev note.