Joe McGill 4bdbfc4526 Themes: Improve support for placeholders in default headers.
When themes register default headers, they can use sprintf style placeholder
strings in place of the template directory URI, which WordPress transforms
in several places by running the value of
`get_theme_support( 'custom-header', 'default-image' )` through `sprintf()`.

This fixes a few places where WordPress skipped the `sprintf()` step and
referenced the `get_theme_support()` value directly.

Props bradyvercher for initial patch.
See #38557.

git-svn-id: https://develop.svn.wordpress.org/trunk@39123 602fd350-edb4-49c9-b593-d223f7449a82
2016-11-03 19:01:16 +00:00
2016-09-06 18:12:09 +00:00
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