[wp-trac] [WordPress Trac] #50322: Site Health "copy info" button: fix focus loss and other improvements

[WordPress Trac]

#50322: Site Health "copy info" button: fix focus loss and other improvements
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 Reporter:  afercia           |       Owner:  (none)
     Type:  defect (bug)      |      Status:  new
 Priority:  normal            |   Milestone:  5.5
Component:  Site Health       |     Version:  5.2
 Severity:  normal            |  Resolution:
 Keywords:  has-patch commit  |     Focuses:  accessibility
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Changes (by afercia):

 * keywords:  needs-patch => has-patch commit


Comment:

 [attachment:"50322.diff"]:

 - uses the `clearSelection()` function from `ClipboardJS`
 - moves focus back to the trigger button to remediate
 https://github.com/zenorocha/clipboard.js/issues/680
 - uses `setTimeout` / `clearTimeout` to hide the "Copied!" visual feedback
 after 3 seconds since last successful copy action
 - minor JS coding standards
 - simplifies the CSS

 To Test:
 - patch and build
 - repeat the steps in the ticket description
 - observe focus is moved back to the Copy button (actually it's so fast
 that it can't be perceived visually)

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Ticket URL: <https://core.trac.wordpress.org/ticket/50322#comment:1>
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