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Allow non-statically created settings to be constructed with custom WP_Customize_Setting subclass.

Parameters

$setting_classstring: WP_Customize_Setting or a subclass.
$setting_idstring: ID for dynamic setting, usually coming from $_POST['customized'].
$setting_argsarray: WP_Customize_Setting or a subclass.

$setting_class = apply_filters( 'customize_dynamic_setting_class', $setting_class, $setting_id, $setting_args );

Used by	Description
WP_Customize_Manager::add_dynamic_settings()`wp-includes/class-wp-customize-manager.php`	Registers any dynamically-created settings, such as those from $_POST[‘customized’] that have no corresponding setting created.
WP_Customize_Manager::add_setting()`wp-includes/class-wp-customize-manager.php`	Adds a customize setting.

Version	Description
4.2.0	Introduced.