[wp-trac] [WordPress Trac] #58905: Ensure locate_template only loads theme files

[WordPress Trac]

#58905: Ensure locate_template only loads theme files
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 Reporter:  jorbin        |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  6.4
Component:  Themes        |    Version:
 Severity:  normal        |   Keywords:  has-patch early
  Focuses:                |
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 It's possible to have locate_template load files that are not template
 files which could be unexpected behavior that breaks the display of a
 page.

 The chance this breaks something is, I think, not infinitesimal.
 Therefore, this should go in early.

 An initial patch is attached.

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Ticket URL: <https://core.trac.wordpress.org/ticket/58905>
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