[wp-trac] [WordPress Trac] #41897: Code Editor: Add reusable code editor Customizer control

[WordPress Trac]

#41897: Code Editor: Add reusable code editor Customizer control
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 Reporter:  westonruter   |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  4.9
Component:  Customize     |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 With the introduction of CodeMirror in #12423 the Custom CSS functionality
 in the Customizer was updated to make use of the new code editor. However,
 the initial integration in [41376] was not done in a way that would allow
 for the code to be re-used in other places (such as adding other instances
 of code editor controls) or to facilitate plugins to extend and customize
 how the Custom CSS control behaves (currently core and
 [https://github.com/Automattic/jetpack/issues/7776 Jetpack conflict]).

 I suggest that the code that is currently hard-coded for the `custom_css`
 textarea control be abstracted into a general `WP_Customiz_Code_Editor`
 control which then can be used for Custom CSS and also for adding code
 editing for anywhere else that a plugin may want it. It can then be
 cleanly extended by Jetpack.

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Ticket URL: <https://core.trac.wordpress.org/ticket/41897>
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