[wp-trac] [WordPress Trac] #59417: `load-styles.php` no longer outputs styles after deprecating TEMPLATEPATH

[WordPress Trac]

#59417: `load-styles.php` no longer outputs styles after deprecating TEMPLATEPATH
-----------------------------------+-----------------------------
 Reporter:  iandunn                |      Owner:  (none)
     Type:  defect (bug)           |     Status:  new
 Priority:  normal                 |  Milestone:  Awaiting Review
Component:  Themes                 |    Version:  trunk
 Severity:  normal                 |   Keywords:
  Focuses:  template, performance  |
-----------------------------------+-----------------------------
 It looks like `load-styles.php` no longer outputs anything after r56635.

 1. Activate TwentyTwentyThree (maybe not necessary)
 1. `git checkout ec21b604e0`. This is the Git equivalent of r56635.
 1. `curl -s https://wp-develop.test/wp-admin/load-styles.php?load=l10n,wp-
 auth-check`. You should see empty output.
 1. `git co @~1`. Check out the commit before r56635.
 1. `curl -s https://wp-develop.test/wp-admin/load-styles.php?load=l10n,wp-
 auth-check`. You should see a couple dozen lines of CSS.

 I think the problem may be related to how `load-styles.php` includes
 `noop.php`, so the  call to `get_option()` in `get_stylesheet()` will
 return `null`. Similar things may happen with regards to hooks.

 `noop.php` doesn't include a stub for `has_filter()`, though, which may
 cause further unexpected behavior in `get_stylesheet_directory()`.

 On wordpress.org we also saw `wp-admin` load without any CSS, but I wasn't
 able to quickly reproduce that in a clean install. It may be due to using
 a parent block theme or some other customization.

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Ticket URL: <https://core.trac.wordpress.org/ticket/59417>
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