Add additional attributes to the ajax `do_shortcode` response

[goldenapples]

We could add a way for shortcodes to return some attributes like suggested dimensions, float value, or basic css styles, along with the shortcode markup.

This would involve a few steps:

• building our own ajax endpoint, which would wrap do_shortcode and augment it with additional functionality available in shortcodes which were registered with Shortcake.
• Adding additional arguments which could be registered with a shortcode to provide additional information. I imagine these arguments living in a register function that lives in parallel to shortcode_ui_register_for_shortcode, maybe something like shortcode_preview_helpers_register_for_shortcode. Developers who wanted to offer additional layout tips for their shortcodes could do that there by registering a function or static value to be returned for one or more attribute fields:
  • class names to be applied to the shortcode preview body.
  • initial dimensions to render the preview at
  • inline styles to attach to the preview, ie display: inline;

[mkeppel]

This morning we got a report of slow List content type that is heavy with Post element gifs.

Convo with Dodai: https://fusionnetwork.slack.com/archives/edit-tech/p1435842468002515

Granted this post will have 50+ list items each with a gif in them but the editor is experiencing extremely slow scrolling speeds on the page. Just noting here so that we can have this tracked I have not gotten many requests of slow WP editor experiences but will keep an ear out for them now.

@goldenapples and I chatted about the situation and potentials for improvements in slack here: https://fusionnetwork.slack.com/archives/tech/p1435842625005052

[goldenapples]

It strikes me that this would be a way of solving several rendering-related issues, including #407 and #372.