[wp-trac] [WordPress Trac] #62988: class-wp-styles.php sends output too early on media-upload.php

[WordPress Trac]

#62988: class-wp-styles.php sends output too early on media-upload.php
--------------------------+-----------------------------
 Reporter:  kkmuffme      |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Media         |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
--------------------------+-----------------------------
 Hook a function on send_headers

 {{{#!php
 <?php
 add_action( 'send_headers', function foo() { header( 'X-Debug: Foo' ); }
 );
 }}}

 Open:
 /wp-admin/media-upload.php?type=image&tab=library&post_id=1234

 You'll get a PHP error that headers have already been sent from wp-
 includes/class-wp-styles.php
 Given this is the "send_headers" hook, there shouldn't be any output sent
 at that point yet though.

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Ticket URL: <https://core.trac.wordpress.org/ticket/62988>
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