Only insert a link to a component to a key frame. - To check if it is a key frame, now, before inserting a link to a component. - When it is not in a key frame, it is supposed to be a "dup" group. We should not make a link there.

divert([-1])

define([_arg1], [$1])

define([_foreach], [ifelse([$2], [()], [],
[define([$1], _arg1$2)$3[]_foreach([$1], (shift$2), [$3])])])

define([foreach], [pushdef([$1])_foreach($@)popdef([$1])])

divert[]dnl