GitLab

(custom-face-edit-deactivate, custom-face-edit-activate)
(custom-face-edit-delete, custom-face-edit-attribute-tag):
New functions.
(custom-face-edit): Specify a custom :convert-widget.
(custom-pre-filter-face-spec, custom-post-filter-face-spec):
Don't pass in default filters that map between `nil' and `off' and
`unspecified' and `nil'.