Re-add deprecated function editAttributeFieldAttachment.getFromCache
#692
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Up until #508, we had a public class method exposed on
editAttributeFieldAttachment
calledgetFromCache()
, which was being used elsewhere to hook into attachment preview rendering and other useful attachment needs. (For example, the Image Shortcake plugin uses it to pull alt, caption, and other values from the attachment and prepopulate those fields on the image shortcode.)I think it would still be helpful to expose this cache, even though it isn't needed anymore internally, just because it costs next to nothing to have in place, and is useful for integration with other fields.