[wp-trac] [WordPress Trac] #29197: Introduce WP_Customize_Container, and have both WP_Customize_Panel and WP_Customize_Section extend it (rather than WP_Customize_Panel extending section)

[WordPress Trac]

#29197: Introduce WP_Customize_Container, and have both WP_Customize_Panel and
WP_Customize_Section extend it (rather than WP_Customize_Panel extending
section)
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 Reporter:  celloexpressions  |      Owner:
     Type:  enhancement       |     Status:  new
 Priority:  normal            |  Milestone:  Future Release
Component:  Customize         |    Version:  trunk
 Severity:  normal            |   Keywords:  has-patch
  Focuses:                    |
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 Continuing on from #28979 and #27406, we need to punt this from 4.0 as
 it's too involved to change now. As a result, we're temporarily marking
 `WP_Customize_Panel` as final until we can implement it.

 Full explanations of this are on #28979, but the gist is: Panels are not
 Sections (implied by the current implementation), Panels and Sections are
 both containers. Now that we have WP_Customize_Manager:containers() (used
 for mixed top-level section/panel sorting), we have containers, but not
 really. This change will allow us to open up WP_Customize_Panel to be
 extended like everything else in the Customizer can be.

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Ticket URL: <https://core.trac.wordpress.org/ticket/29197>
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