File: wp-includes/class-wp-customize-widgets.php

Converts a widget_id into its corresponding Customizer setting ID (option name).

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Determines whether the widget is considered “wide”.

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Converts a widget ID into its id_base and number components.

Override sidebars_widgets for theme switch.

Filters old_sidebars_widgets_data Customizer setting.

Filters sidebars_widgets option for theme switch.

Ensures all widgets get loaded into the Customizer.