Thumbnails are not removed when the main image is deleted

[SergeyBiryukov]

wp_delete_attachment() relies on attachment metadata when removing intermediate images:
​http://core.trac.wordpress.org/browser/tags/3.3.1/wp-includes/post.php#L3820

Since [20435], the metadata is no longer accessible (deleted from both database and cache) at that point.

[ryan]

In [20770]:

Collect intermediate images before deleting an attachment and its meta. Fixes thumbnail deletion. Props SergeyBiryukov. fixes #20658

[nacin]

Should we double-check the rest of [20435]?

[SergeyBiryukov]

Replying to nacin:

Should we double-check the rest of [20435]?

The rest seems fine.