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Widgets: Preserve classic sidebars when switching to a block theme.

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When switching to a block theme, classic sidebars were orphaned and their widgets remapping to the `'wp_inactive_widgets'` sidebar . This changeset preserves the sidebars and their widgets, providing a migration path to a block theme without losing the widgets.

Classic sidebars are now:

* Stored in a new theme mod called `'wp_classic_sidebars'`;
* Restored to the `$wp_registered_sidebars` global variable when the `'widgets_init'` action fires (via a new internal function called `_wp_block_theme_register_classic_sidebars()`);
* And marked as `'inactive'` when interacting with sidebars REST API endpoint.

References:
* [https://github.com/WordPress/gutenberg/pull/45509 Gutenberg PR 45509] which adds an option for importing widgets from sidebars into template parts.

Follow-up to [50995], [6334].

Props mamaduka, audrasjb, hellofromTonya, ironprogrammer, jameskoster, joen, matveb, mukesh27, noisysocks, poena, youknowriad.
Fixes #57531.

git-svn-id: https://develop.svn.wordpress.org/trunk@55200 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Tonya Mork
2023-02-03 00:13:52 +00:00
parent a501f4f40d
commit 8ff5899348
6 changed files with 194 additions and 1 deletions
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26
src/wp-includes/widgets.php
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@@ -2105,3 +2105,29 @@ function wp_check_widget_editor_deps() {
}
}
}
/**
* Registers the previous theme's sidebars for the block themes.
*
* @since 6.2.0
* @access private
*
* @global array $wp_registered_sidebars Registered sidebars.
*/
function _wp_block_theme_register_classic_sidebars() {
global $wp_registered_sidebars;
if ( ! wp_is_block_theme() ) {
return;
}
$classic_sidebars = get_theme_mod( 'wp_classic_sidebars' );
if ( empty( $classic_sidebars ) ) {
return;
}
// Don't use `register_sidebar` since it will enable the `widgets` support for a theme.
foreach ( $classic_sidebars as $sidebar ) {
$wp_registered_sidebars[ $sidebar['id'] ] = $sidebar;
}
}