[wp-trac] [WordPress Trac] #59279: Unnecessarily check to see site is using a child theme in the theme functions.

[WordPress Trac]

#59279: Unnecessarily check to see site is using a child theme in the theme
functions.
--------------------------+--------------------
 Reporter:  spacedmonkey  |      Owner:  (none)
     Type:  enhancement   |     Status:  new
 Priority:  normal        |  Milestone:  6.4
Component:  Themes        |    Version:  4.7
 Severity:  normal        |   Keywords:
  Focuses:  performance   |
--------------------------+--------------------
 Follow on from #58576 / [56357].

 There are a number of functions methods that check to see if file exists
 in a child theme before falling back to parent theme. However these
 functions do not check to see if current theme. These functions include.

 -
 [https://developer.wordpress.org/reference/classes/wp_theme/get_file_path/
 WP_Theme::get_file_path]
 -
 [https://developer.wordpress.org/reference/functions/get_theme_file_path/
 get_theme_file_path]
 - [https://developer.wordpress.org/reference/functions/get_theme_file_uri/
 get_theme_file_uri]

 The function `is_child_theme` can not be used, as `TEMPLATEPATH` and
 `STYLESHEETPATH`, might be different from the result of
 `get_stylesheet_directory()` and `get_template_directory()`. These
 functions have filters.

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Ticket URL: <https://core.trac.wordpress.org/ticket/59279>
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