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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