bug#9159: 24.0.50; `undo' is not as good as it should be wrt property changes

[Lars Magne Ingebrigtsen]

"Drew Adams" <drew.adams@oracle.com> writes:

>> If we have established that there is no semantic difference 
>> between nil properties and missing properties, then this sounds
>> like there could be (very minor) memory and redisplay efficiencies
>> to be won here.
>
> Presumably Stefan agrees (?) but considers that improvement only cosmetic, so
> fodder for the wishlist (/dev/null) cannon.

The added complexity to the code is probably not worth the (very minor)
memory gains.

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