Weston Ruter 8efc416f64 Customize: Allow starter content to apply in a new theme when switching from another theme containing changes. ...

* Ensure that starter content can apply from theme B after previewing starter content in theme A.
* Introduce new `starter_content` flag in changeset setting params which is used to capture whether a value is starter content and thus can be overridden.
* Create changeset up-front with `starter_content` flags instead of waiting for `AUTOSAVE_INTERVAL`.
* Eliminate instantiation of settings for widget instances in favor of directly calling `sanitize_widget_js_instance`. This eliminates issues with looking for widgets before they are registered.
* Ensure that non-placeholders (inline arrays instead of string references) can be supplied in starter content.
* Re-use auto-draft posts as starter content across theme switches.
* Introduce `starter_content` param for `WP_Customize_Manager::save_changeset_post()` which is `false` except when starter content is being loaded on a `fresh_site`.

See #38114.
Fixes #38541.

Built from https://develop.svn.wordpress.org/trunk@39241


git-svn-id: http://core.svn.wordpress.org/trunk@39181 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2016-11-15 09:03:32 +00:00

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