wp-includes/class-wp-customize-manager.php:839Gets the theme being customized.
WP_Theme public function theme() { if ( ! $this->theme ) { $this->theme = wp_get_theme(); } return $this->theme; }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.