wp-includes/class-wp-customize-manager.php:666Callback to validate a theme once it is loaded
public function after_setup_theme() { $doing_ajax_or_is_customized = ( $this->doing_ajax() || isset( $_POST['customized'] ) ); if ( ! $doing_ajax_or_is_customized && ! validate_current_theme() ) { wp_redirect( 'themes.php?broken=true' ); exit; } }Introduced in 3.4.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-customize-manager.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.