Replace Media Library "Load more" with actual Pagination

[mrleblanc101]

This is a follow-up to #65564.

"Load more" offer no sense of progress and is not flexible.
What if I know the image if on the last page ? I need to click 10 time...

I know you could use the "Upload month" dropdown filter, but it being on the last page of the media library doesn't mean it's on the fist upload month.

[joedolson]

This is something that has been explored in the past, but it would require some major changes to the media modal, due to inadequate updating of collections when items are added or removed, which cause a lot of problems with pagination.

Making those changes are high risk for breaking extender implementations, because they would change APIs for handling the collection. So while this is legitimately a change we'd like to make, it's just not a very realistic option with the current code base.

There is an experimental media modal being built in Gutenberg, which you can enable within the experiments module of the plugin, and it does include pagination.