Joe McGill f64f956847 Themes: Improve reliability of URL used in get_header_image_tag().
`get_header_image_tag()` relies on the data returned by `get_custom_header()`
to build the attributes for the header `<img>` element. However,
`get_custom_header()` relies on data from the `header_image_data` theme
mod rather than the `header_image` theme mod that `get_header_image()` uses.
This can create inconsistencies when no header image is set, but a theme
supports a default header image.

This fixes the issue by making `get_custom_image_tag()` rely on the URL
returned by `get_header_image()` instead.

Props bradyvercher.
Fixes #38633.

git-svn-id: https://develop.svn.wordpress.org/trunk@39121 602fd350-edb4-49c9-b593-d223f7449a82
2016-11-03 12:36:01 +00:00
2016-09-06 18:12:09 +00:00
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