[wp-trac] [WordPress Trac] #26985: Use network_site_url in includes_dir

[WordPress Trac]

#26985: Use network_site_url in includes_dir
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 Reporter:  nofearinc           |      Owner:
     Type:  defect (bug)        |     Status:  new
 Priority:  normal              |  Milestone:  Awaiting Review
Component:  Networks and Sites  |    Version:  trunk
 Severity:  normal              |   Keywords:  has-patch
  Focuses:  multisite           |
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 The `includes_dir` function is used in several places for getting the path
 to `wp-includes`. For example, `class-wp-editor.php` is using it to get
 the `$baseurl` variable and load other related scripts (such as TinyMCE)
 accordingly.

 On a multisite, `includes_dir` relies on `site_url` which leads to a
 similar path if ran on a subsite in a network:

 {{{
 site.com/subsite/wp-includes/...
 }}}

 If a server like nginx doesn't have a working rewrite for a given version,
 across the site we could use hooks such as `script_loader_src` or
 `style_loader_src` to work around the problem, and we could also filter
 `includes_url` to set the correct paths (as workarounds). I suggest
 switching to `network_site_url` instead as it fallbacks to `site_url` for
 single sites.

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Ticket URL: <https://core.trac.wordpress.org/ticket/26985>
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