[wp-trac] [WordPress Trac] #35617: Export more Customizer app settings in preview

[WordPress Trac]

#35617: Export more Customizer app settings in preview
-------------------------+-----------------
 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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 As more logic is added to the Customizer preview (e.g. selective refresh
 and inline controls), more of the Customizer's app settings need to be
 available.

 * Preview nonce.
 * Other nonces added via `customize_refresh_nonces`.
 * Current theme (stylesheet and whether active).
 * The previewed URL.

 Some of these are currently being exported to JS with each refresh via the
 `WP_Customize_Nav_Menus::export_preview_data()`, and should be moved to
 the core app settings exported to `wp.customize.settings`.

 Additionally, the nonce settings should be refreshed whenever a `nonce-
 refresh` happens in the pane.

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Ticket URL: <https://core.trac.wordpress.org/ticket/35617>
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