Weston Ruter 64e9d9f4eb Customize: Use selective refresh for custom header changes when possible.
* Use `postMessage` transport for header image settings by default when video headers are supported, and thus `the_custom_header_markup()` will necessarily be used (and thus a selective refresh partial will be available).
* Ensure that `the_custom_header_markup()` always outputs a container element in the customizer preview even if the header is empty.
* Ensure that edit shortcut appearing for custom header does not get positioned off-screen.

Props bradyvercher, westonruter.
See #38639.
Fixes #38737.


git-svn-id: https://develop.svn.wordpress.org/trunk@39227 602fd350-edb4-49c9-b593-d223f7449a82
2016-11-14 18:40:08 +00:00
2016-09-06 18:12:09 +00:00
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