save_state() in postbox.js should look at the hidden checkboxes instead of :hidden

[markoheijnen]

At this moment save_state() looks at all the metaboxes that are really hidden with filter(':hidden'). With can lead to weird behavior when a plugin starts to hide a metabox in some cases since it can be showed/hidden by default.

I was wondering if it is possible to look at the checkboxes and mapped them as a string and pass it to the AJAX action closed-postboxes.

[markoheijnen]

Change hidden code

[adamsilverstein]

This patch concept looks fine and in my brief testing I verified that it is returning the same list of ids.

My only concern here would be that checkboxes may not always line up with the actual postboxes (although they should). Also, I'm not certain I understand the use case - you are hiding a metabox manually, but don't want it passed in the 'hidden' list?

[chriscct7]

I feel like at this point any plugin that was affected by this would have worked around this by now, and that the implementation of the proposed patch could actually break plugins. Further, I echo @adamsilversein's question about the use case for this. Closing as wontfix given afterformentioned and lack of further requests or activity in the last 2 years