2021-12-29  Stefan Monnier <monnier@iro.umontreal.ca>

	Use the built-in function invisible-p to replace a hand-made
	function ilist-invisible-property-p.

	Correct the use of an argument to the macro
	ilist-define-automatic-group.

	Provide a better way to handle the definition of sorters in the
	macro ilist-define-automatic-group.

2021-12-28  李俊緯  <mmemmew@gmail.com>

	Update documentation.

	Also add the options to skip invisible lines to some primitive
	commands.

