[wp-trac] [WordPress Trac] #29618: Improve `is_child_theme` to check for a valid Template value in child stylesheet comment header

[WordPress Trac]

#29618: Improve `is_child_theme` to check for a valid Template value in child
stylesheet comment header
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 Reporter:  lancewillett  |       Owner:
     Type:  enhancement   |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Themes        |     Version:
 Severity:  normal        |  Resolution:
 Keywords:  has-patch     |     Focuses:
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Comment (by lancewillett):

 Counterpoint: without this suggested change, `is_child_theme()` isn't
 accurate. And misleading.

 What are the performance concerns if `WP_Theme` is properly cached?

 Can we instead add a method that is accurate to `WP_Theme`, then?

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Ticket URL: <https://core.trac.wordpress.org/ticket/29618#comment:2>
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