Method: {@internal Missing Summary}

Method: Ensures the HTML data-* attributes for selective refresh are allowed by kses.

Method: {@internal Missing Summary}

Method: Begins keeping track of the current sidebar being rendered.

Method: Finishes keeping track of the current sidebar being rendered.

Method: Override sidebars_widgets for theme switch.

Method: Renders the widget form control templates into the DOM.

Method: Determine if a widget is rendered on the page.

Method: Filters old_sidebars_widgets_data Customizer setting.

Method: Calls admin_print_footer_scripts and admin_print_scripts hooks to allow custom scripts from plugins.