[wp-trac] [WordPress Trac] #46540: Admin bar CSS shouldn't be added in the customizer

[WordPress Trac]

#46540: Admin bar CSS shouldn't be added in the customizer
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 Reporter:  nabil_kadimi             |       Owner:  (none)
     Type:  defect (bug)             |      Status:  new
 Priority:  normal                   |   Milestone:  5.2
Component:  Customize                |     Version:  4.5
 Severity:  normal                   |  Resolution:
 Keywords:  has-patch needs-testing  |     Focuses:  administration
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Comment (by westonruter):

 Replying to [comment:5 nabil_kadimi]:
 > But I'm thinking that the customizer shouldn't make any difference
 between HTML in `body` or `head`.

 I think it would still be problematic because things in the `head` are
 generally special in controlling the page.

 I think actually actually this isn't a good fit for selective refresh.
 Since everything is in an external stylesheet, the only thing needed is to
 update the URL of the stylesheet, no? So then what if you used
 `postMessage` and then added some JS to the preview like this:

 {{{#!js
 wp.customize( 'my-custom-stylesheet', ( setting ) => {
     setting.bind( () => {
         const link = document.querySelector( 'link#my-stylesheet' );
         const url = new URL( link.href );
         url.searchParams.set( 'cache-bust', Math.random() );
         link.href = url.href;
     } );
 } );
 }}}

 So this would just update the URL to the stylesheet whenever the relevant
 setting changes.

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Ticket URL: <https://core.trac.wordpress.org/ticket/46540#comment:6>
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