When deleting media grid attachments, wait until the server responds before removing the model from its collection.

Props 5um17.
Fixes #30457.

Built from https://develop.svn.wordpress.org/trunk@30638


git-svn-id: http://core.svn.wordpress.org/trunk@30628 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix edge-case in media cropping where selection and destination are the same size.

Adds unit tests.

Props mboynes.
Fixes #19793.

Built from https://develop.svn.wordpress.org/trunk@30639


git-svn-id: http://core.svn.wordpress.org/trunk@30629 1a063a9b-81f0-0310-95a4-ce76da25c4cd