Improvements to face customization interface.
* lisp/cus-edit.el (custom-variable, custom-face): Doc fix. (custom-face-edit): Add value-create attribute. (custom-face-edit-value-create) (custom-face-edit-value-visibility-action): New functions. Hide unused face attributes by default, and add a visibility toggle. (custom-face-edit-deactivate): Show empty values with shadow face. (custom-face-selected): Only use this for face specs with default attributes. (custom-face-value-create): Cleanup. * lisp/wid-edit.el (widget-checklist-value-create): Use dolist. (widget-checklist-match-find): Make second arg optional.
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