[wp-trac] [WordPress Trac] #39896: Customizer: Allow users to Draft changes before Publishing

[WordPress Trac]

#39896: Customizer: Allow users to Draft changes before Publishing
-------------------------+--------------------------
 Reporter:  melchoyce    |       Owner:  westonruter
     Type:  enhancement  |      Status:  accepted
 Priority:  normal       |   Milestone:  4.9
Component:  Customize    |     Version:
 Severity:  normal       |  Resolution:
 Keywords:               |     Focuses:  ui
-------------------------+--------------------------
Changes (by westonruter):

 * owner:   => westonruter
 * status:  new => accepted


Comment:

 Initial progress on implementing autosave revision support in the
 Customizer: https://github.com/xwp/wordpress-develop/pull/256

 Screenshot of notice warning added can be seen in [attachment:autosave-
 notice.png]. I just copied verbatim the string that gets shown on the edit
 post screen.

 Most of the remaining work is on the PHP side of things in the pull
 request:

 * Querying for a user's recent auto-draft changesets if they don't have an
 existing one loaded.
 * When the Customizer loads with a blank changeset UUID, grab the most
 recent `draft` or `future` changeset, and if one exists, use its UUID
 instead of generating a new one. This behavior would need to be able to be
 disabled to allow Customize Snapshots to be able to have multiple
 changesets living concurrently.
 * Update admin-ajax endpoint to support the `autosave_revision` param.
 * Delete the auto-draft changeset or a loaded changeset's autosave
 revision when dismissing the above notice.
 * Load changeset data from autosave revision when `autosaved` param is
 provided.
 * Delete an autosave revision when saving a changeset fully (as a draft,
 future, or publish).
 * And more I'm sure…

 For more notes on implementation, see first half of conversation in thread
 at: https://wordpress.slack.com/archives/C0381N237/p1504725296000135

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Ticket URL: <https://core.trac.wordpress.org/ticket/39896#comment:60>
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