[wp-trac] [WordPress Trac] #31897: Update Customizer nonces via Heartbeat API

[WordPress Trac]

#31897: Update Customizer nonces via Heartbeat API
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 Reporter:  westonruter                          |       Owner:
     Type:  enhancement                          |      Status:  assigned
 Priority:  low                                  |   Milestone:  Future
Component:  Customize                            |  Release
 Severity:  normal                               |     Version:  3.4
 Keywords:  needs-unit-tests needs-refresh has-  |  Resolution:
  patch                                          |     Focuses:  javascript
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Comment (by westonruter):

 In [changeset:"41839"]:
 {{{
 #!CommitTicketReference repository="" revision="41839"
 Customize: Add changeset locking in Customizer to prevent users from
 overriding each other's changes.

 * Customization locking is checked when changesets are saved and when
 heartbeat ticks.
 * Lock is lifted immediately upon a user closing the Customizer.
 * Heartbeat is introduced into Customizer.
 * Changes made to user after it was locked by another user are stored as
 an autosave revision for restoration.
 * Lock notification displays link to preview the other user's changes on
 the frontend.
 * A user loading a locked Customizer changeset will be presented with an
 option to take over.
 * Autosave revisions attached to a published changeset are converted into
 auto-drafts so that they will be presented to users for restoration.
 * Focus constraining is improved in overlay notifications.
 * Escape key is stopped from propagating in overlay notifications, and it
 dismisses dismissible overlay notifications.
 * Introduces `changesetLocked` state which is used to disable the Save
 button and suppress the AYS dialog when leaving the Customizer.
 * Fixes bug where users could be presented with each other's autosave
 revisions.

 Props sayedwp, westonruter, melchoyce.
 See #31436, #31897, #39896.
 Fixes #42024.
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/31897#comment:34>
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