Copy on change properties propagated to SubShapeBinder can be changed
there and then updated in the base body (support). On the other hand,
they might be used in calculation of some other properties in the base
body which could also be copy on change and propagated to the same
SubShapeBinder. It looks natural that these latter properties should be
updated with the calculation results as well.
Example:
Body has copy on change properties A = 200 mm and B = 3 * A = 600 mm.
SubShapeBinder with support of Body has A changed to 300 mm and expects
B = 3 * 300 mm = 900 mm. Without this change B is not updated and equals
to 600 mm in SubShapeBinder as well.
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