Fix bug of calculator. - calc can not handle button press event. - It caused by miss-understanding event_t::cur_tgt. It is a subject, not a shape that calc think. - event_t::cur_tgt::obj is a shape that calc want. It is a the subject that the subject stands for.

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