[wp-trac] [WordPress Trac] #47752: Fix upload of .srt files

[WordPress Trac]

#47752: Fix upload of .srt files
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 Reporter:  afercia       |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  5.3
Component:  Upload        |    Version:  5.0.1
 Severity:  normal        |   Keywords:  needs-patch has-screenshots
  Focuses:                |
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 See #45615, #45622, [44438], [44439], and [44443].

 Files with `.srt` extension are meant for video subtitles (captions), much
 like `.vtt` files. After the changes to make the mime type check stricter
 in WordPress 5.0.1 (backported to 4.9.9, etc.), uploading `.srt` files can
 fail because of mismatched MIME type check. Actually, `.vtt` can be served
 as `text/plain` depending on the server configuration.

 Before WordPress 5.0.2, `.srt` files could be uploaded without issues.

 For example, on a standard VVV install, the upload fails. Test file from
 the `mediaelement-files` GitHub repo:
 https://github.com/mediaelement/mediaelement-
 files/blob/master/mediaelement.srt

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Ticket URL: <https://core.trac.wordpress.org/ticket/47752>
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