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#133 snit: Multi-delegation for options
For options it sometimes makes sense to delegate
changes to more than one component of a megawidget.
For example: -background, -foreground of a megawidget
may go to all components.
Currently we have no convenient way to specify such
multi-delegation. We can do it through an 'onconfigure'
handler, but this is inconvenient.
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After considerable though, it turns out that this isn't delegation at all, but
propagation. The difference is that in delegation the option's value is
owned by a component; in propagation, the option's value rightfully
belongs to the megawidget, while 1 or more components are constrained
to have their options set to the same value as the component's option.
The best way to handle this at present is through a snit::macro.