GitLab

	(syms_of_xfaces): Provide `:ignore-defface'.
	(IGNORE_DEFFACE_P): New macro.
	(check_lface_attrs): Qignore_defface is a possible value.
	(lface_fully_specified_p): Likewise.
	(Finternal_set_lisp_face_attribute): Likewise.
	(merge_face_vectors): The merged face is `unspecified' if the
	mergee specifies `:ignore-defface'.