e174fdf21b
When a custom header image was set but custom CSS was not, `wp_get_custom_css_post()` was generating an UPDATE query on every frontend request. In theme options the header image meta data is stored as an object. In `update_option()` this hits an edge case as the resource IDs of the old and new values never match. This changes the logic of `wp_get_custom_css_post()` to ensure `set_theme_mod()` is only called when the custom CSS has changed. Props bradyvercher, helen. Fixes #38866. git-svn-id: https://develop.svn.wordpress.org/trunk@39338 602fd350-edb4-49c9-b593-d223f7449a82