[wp-trac] [WordPress Trac] #54939: When a block theme is active, add Site Editor link and notice to the Customizer UI

[WordPress Trac]

#54939: When a block theme is active, add Site Editor link and notice to the
Customizer UI
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 Reporter:  ironprogrammer  |      Owner:  (none)
     Type:  enhancement     |     Status:  new
 Priority:  normal          |  Milestone:  Awaiting Review
Component:  Customize       |    Version:
 Severity:  normal          |   Keywords:  has-screenshots
  Focuses:                  |
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 == Primary Objectives
 - Encourage users to utilize Site Editor for the best full site
 customization experience.
 - Provide a link to the Site Editor.
 - Keep presentation basic and consistent with existing Customizer design
 paradigm.

 == Secondary Objectives
 - Teach and reinforce Site Editor use for users who may have previously
 relied on Customizer.
 - Clarify that Customizer is not intended for use with block themes.

 == Context
 1. User has installed WordPress 5.9+.
 2. User has activated a block theme, such as "Twenty Twenty-Two".
 3. User has navigated directly to Customizer via `/wp-admin/customize.php`
 (this link is not emitted in admin menus when a block theme is active).

 == Proposed Enhancement
 To stay consistent with the existing layout and styling of Customizer, add
 a "warning" notice to the Customizer sidebar. The notice should encourage
 users to switch to Site Editor, which offers many more customization
 options, and is designed to work with the active theme.

 In addition to the notice text, add a prominent button that links directly
 to Site Editor.

 The copy used in the notice could touch on multiple objectives, but it may
 be best to keep it as simple and direct as possible. It may be surprising
 enough to users that Customizer is discouraged with block themes.

 Please see attached layout comp for an example of placement, styling, and
 verbiage for this notice.


 Props @matt @matveb @hellofromtonya @antonvlasenko

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Ticket URL: <https://core.trac.wordpress.org/ticket/54939>
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