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Convert the widget settings from single to multi-widget format. See ticket #8441 for more information.
Since: 2.8.0
wp_convert_widget_settings() is located in wp-includes/widgets.php
Widgets: is_active_widget(), the_widget(), register_widget(), unregister_widget(), wp_register_widget_control(), wp_unregister_widget_control(), wp_convert_widget_settings(), wp_get_widget_defaults(), wp_widget_description()