[wp-trac] [WordPress Trac] #35616: Align settings in Customizer preview with settings in Customizer pane

[WordPress Trac]

#35616: Align settings in Customizer preview with settings in Customizer pane
-------------------------+-----------------
 Reporter:  westonruter  |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  4.5
Component:  Customize    |    Version:  3.4
 Severity:  normal       |   Keywords:
  Focuses:  javascript   |
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 The JS models for Customizer settings in the Customizer preview are
 somewhat shallow representations of the settings in the Customizer pane.
 Indeed, the objects in the preview are mere `wp.customize.Value` objects
 as opposed to `wp.customize.Setting` objects. A few issues:

 * The setting objects in the preview lack an `id` property.
 * When new settings get instantiated in the pane and get synced into the
 preview, the settings are just silently ignored as opposed to being
 created on demand as is when the `settings` message is received by the
 preview.
 * The `_dirty` flags for settings in the preview don't always correspond
 to the corresponding settings in the pane, e.g. they get reset after a
 refresh and they fail to reset after `saved`.

 These improvements are key for performing more logic inline to the
 preview, such as selective refresh (#27355).

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Ticket URL: <https://core.trac.wordpress.org/ticket/35616>
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