[wp-trac] [WordPress Trac] #33600: Add `theme_mods_{$stylesheet}` option during `populate_options()`

[WordPress Trac]

#33600: Add `theme_mods_{$stylesheet}` option during `populate_options()`
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 Reporter:  dlh                                  |       Owner:  (none)
     Type:  enhancement                          |      Status:  new
 Priority:  normal                               |   Milestone:  Future
                                                 |  Release
Component:  Themes                               |     Version:
 Severity:  normal                               |  Resolution:
 Keywords:  has-patch has-unit-tests needs-      |     Focuses:
  testing-info                                   |
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Comment (by dlh):

 The problem occurs when `get_theme_mod()` is called before
 `set_theme_mod()` is, if it ever is. The behavior was described in more
 detail in #14828, and it was fixed there for theme activations, but not
 new installations.

 The `wp_get_custom_css_post()` function, introduced in 4.7,
 [https://github.com/WordPress/wordpress-
 develop/blob/71732ba84e508d29ec35fb30e797653f5dd779e7/src/wp-
 includes/theme.php#L2012 saves a theme mod], and since that function is
 called regularly, the change proposed in this ticket has little practical
 impact today, although I still think it's technically sound.

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Ticket URL: <https://core.trac.wordpress.org/ticket/33600#comment:6>
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