"My shipping information is the same..." checkbox is disabled when an address is selected

(Assuming shipping information can be marked to be the same as billing...)
When a saved address is selected in shipping, the copy billing info checkbox disappears and the shipping fieldset is being shown. This is much less appealing since after a single purchase there is already a default shipping address saved which makes the hidden shipping fieldset always shown, making the copy profile info checkbox less than useful. I did not want the shipping fields to always be shown, similar to how commerce_kickstart v2.0-rc1 has addressbook implemented with commerce_addressbook v2.0-rc6, so I disabled the code that causes this behavior. Said code in commerce_addressbook.module, lines 331 - 357, which need to be removed/commented.

I would recommend applying this change to the main branch, this is undesired behavior IMHO.

See https://drupal.org/node/1427264 which wrongly assumes this is shipping module related.