[wp-trac] [WordPress Trac] #30757: Changes to color controls are reverted when customize-loader.js is used

[WordPress Trac]

#30757: Changes to color controls are reverted when customize-loader.js is used
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 Reporter:  celloexpressions  |      Owner:
     Type:  defect (bug)      |     Status:  new
 Priority:  normal            |  Milestone:  Future Release
Component:  Customize         |    Version:  4.0
 Severity:  normal            |   Keywords:  needs-patch
  Focuses:                    |
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 Despite the high likelihood that this is a 4.1 regression, I've confirmed
 it in 4.0.

 Steps to reproduce:
 1. From the themes screen, with Twenty Fifteen active (though it's not
 Twenty Fifteen-specific), open the Customizer with the "Customize" button
 on the active theme.
 2. Change the background color (or any color), note that it updates in the
 preview, then save and publish. Close the Customizer. Optionally verify
 that the new color is live on the frontend in a new tab.
 3. Reopen the Customizer from the Customize button on the themes page.
 Make  sure there was no page load in between closing and reopening the
 Customizer.
 4. As soon as the Customizer loads, the previous color is applied in the
 controls, and subsequently in the preview.

 Note that this particular Customize button, along with a few others, loads
 the Customizer in a full-screen iframe, so the issues are likely related
 to `customize-loader.js`.

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Ticket URL: <https://core.trac.wordpress.org/ticket/30757>
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