[wp-trac] [WordPress Trac] #49166: need a function to know if a dashicon exists.

[WordPress Trac]

#49166: need a function to know if a dashicon exists.
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 Reporter:  sebastienserre     |       Owner:  (none)
     Type:  enhancement        |      Status:  new
 Priority:  normal             |   Milestone:  Awaiting Review
Component:  General            |     Version:
 Severity:  normal             |  Resolution:
 Keywords:  2nd-opinion has-   |     Focuses:  ui, administration, template
  patch                        |
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Comment (by sebastienserre):

 As per a discussion with @clorith on Slack #core, I had the idea on a
 private project where I use the Dashicons.
 I made a  foreach to display social network and fall on ```<span
 class="dashicons dashicons-linkedin"></span>``` which doesn't exist yet.
 SO I searched how to know programatically is the dashicon exists or not

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Ticket URL: <https://core.trac.wordpress.org/ticket/49166#comment:5>
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