custom-toggle-hide-facecustom-toggle-hide-face is a compiled Lisp function in `
cus-edit.el'. (custom-toggle-hide-face VISIBILITY-WIDGET &rest IGNORE) Toggle the visibility of a `custom-face' parent widget. By default, this signals an error if the parent has unsaved changes. If the parent has a `simple' :custom-style property, the present value is saved to its :shown-value property instead.