David A. Kennedy 5b41a1c33e Twenty Seventeen: Make custom header preview match front end in Customizer when changed
* Toggles `has-header-image` body class  in Customizer preview whenever images or videos are added or removed.
* Hides the `.custom-header-image`div in CSS when an image or video haven't been set so preview changes are smoother.
* Also fixes the main issues in #38391 – making the preview match.

Props bradyvercher.

Fixes #38627.
See #38391.


git-svn-id: https://develop.svn.wordpress.org/trunk@39220 602fd350-edb4-49c9-b593-d223f7449a82
2016-11-14 11:22:25 +00:00
2016-09-06 18:12:09 +00:00
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