[wp-trac] [WordPress Trac] #55628: Numerous console errors on Theme/Plugin File Editor screens and syntax highlighting not working

[WordPress Trac]

#55628: Numerous console errors on Theme/Plugin File Editor screens and syntax
highlighting not working
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 Reporter:  ndiego                     |       Owner:  (none)
     Type:  defect (bug)               |      Status:  new
 Priority:  normal                     |   Milestone:  6.0
Component:  Script Loader              |     Version:  trunk
 Severity:  normal                     |  Resolution:
 Keywords:  needs-patch needs-testing  |     Focuses:  javascript
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Comment (by jsnajdr):

 I think there is a bug in `WP_Scripts::do_item`. For every script to be
 printed, it does a `$this->in_default_dir()` check and if the script is in
 the default dir and satisfies a few other conditions, it will be
 concatenated. On encountering a script that can't be concatenated, the so-
 far concatenated scripts will be printed and the processing proceeds
 without concatenation.

 Things go wrong when a script in default dir (like `common`) depends on a
 script that's not in the default dir. Then the dependency won't be printed
 correctly. And that's exactly the case with our `wp-i18n` dependency. With
 Gutenberg disabled, it's in default dir and everything works. But when
 Gutenberg registers its own version of `wp-i18n`, it's no longer in
 default dir and the printing becomes incorrect.

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Ticket URL: <https://core.trac.wordpress.org/ticket/55628#comment:15>
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