[wp-trac] [WordPress Trac] #42609: Regression: WordPress 4.9 plugin/theme editor cannot edit files when running on a Windows based server

[WordPress Trac]

#42609: Regression: WordPress 4.9 plugin/theme editor cannot edit files when
running on a Windows based server
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 Reporter:  Otto42                                |       Owner:
     Type:  defect (bug)                          |      Status:  new
 Priority:  normal                                |   Milestone:  4.9.1
Component:  Editor                                |     Version:  4.9
 Severity:  normal                                |  Resolution:
 Keywords:  has-patch 2nd-opinion good-first-bug  |     Focuses:
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Comment (by 247pinger):

 I just wanted to add that this is not Windows specific... I am unable to
 edit new files added to my theme. But I am able to edit files that were a
 part of my theme prior to upgrading to 4.9.

 I just created a new file called "page-giftcards.php" using the touch
 ("page-giftcards.php") php code in one of my other theme files (which
 worked until updating to 4.9).

 And not only does the file not show up in the list of theme files as seen
 through the dashboard (I have verified it's existence by logging into the
 server via SSH)... but when I hack the URL of my theme editor to try and
 edit page-giftcards.php specifically...

 I am told "Sorry, that file cannot be edited."

 And yes I have checked all of the permissions. The file permissions for
 the new page-giftcards.php is exactly the same as every other file in the
 theme folder (that is editable).

 Did wordpress security implement a new method of verifying theme files or
 something? And it won't let me edit a file that it does not consider part
 of it's theme?

 I am very stumped over this.

 Running Debian 8.6 and NGINX.

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Ticket URL: <https://core.trac.wordpress.org/ticket/42609#comment:5>
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