[wp-trac] [WordPress Trac] #60194: Add Preview in Playground buttons to plugin install screens

[WordPress Trac]

#60194: Add Preview in Playground buttons to plugin install screens
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 Reporter:  tellyworth       |      Owner:  (none)
     Type:  feature request  |     Status:  new
 Priority:  normal           |  Milestone:  Awaiting Review
Component:  Plugins          |    Version:  trunk
 Severity:  normal           |   Keywords:
  Focuses:                   |
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 Proposal: add Preview buttons to plugin install screens within wp-admin.

 Background:

 The WordPress.org Plugin Directory now supports a Live Preview feature
 based on Playground; see https://meta.trac.wordpress.org/ticket/7251 for
 context.

 You can see an example working on the https://wordpress.org/plugins
 /convert-to-blocks/ plugin. Previews are currently only enabled on plugins
 where the developer has opted in and provided a blueprint.json file (which
 provides setup and configuration info).

 The preview button on the web site works simply by redirecting from
 `https://wordpress.org/plugins/PLUGIN-SLUG/?preview=1` to a
 `playground.wordpress.net` URL which loads the plugin's blueprint file. It
 opens the playground URL in a new window using `target="_blank"`.

 I'm proposing that we do essentially the same thing from within wp-admin,
 on screens with an Install button for plugins: add a Preview button, which
 opens `https://wordpress.org/plugins/PLUGIN-SLUG/?preview=1` in a new
 window.

 The wordpress.org plugins API already returns a `preview_link` property
 containing the appropriate URL for plugins with a working preview.

 I'll attach a diff with a minimal implementation; this is intended as a
 starting point for testing and discussion, not a finished patch in its
 current state.

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Ticket URL: <https://core.trac.wordpress.org/ticket/60194>
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