feature request: __modified_property__ & __modified_value__

[Ben Abbott]

Given the general absence of low level function for handling the  
dependence and relationships between such things as ...

(1) Figure: papersize, paperunits, papertype, paperposition,  
paperpositionmode

(2) Figure: units -> position

(3) Axes: units -> position, outerposition, tightinset

(4) Axes: activepositionproperty, position, outerposition, tightinset,  
and children

... and perhaps others, might some new properties by added to allow m- 
files to handle such things?

Perhaps a new property can be added:  __modified_items__ ?

This item will need to be able to represent multiple changes for  
multiple objects.

__modified_items__.handles(1:num) -> handles to the modified objects
__modified_items__.property{1:num} -> name of the modified properties
__modified_items__.values{1:num} -> the old values.

... or might there be a more elegant way of doing this?

Ben