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bug#9159: 24.0.50; `undo' is not as good as it should be wrt property ch
bug#9159: 24.0.50; `undo' is not as good as it should be wrt property changes
Tue, 02 Aug 2011 15:10:26 -0400
Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)
>> > C-M-_ to undo the last change.
>> > With point in the same place, do `C-u C-x ='.
>> > That shows that there is property `foo' there, with value nil.
>> Do you have an example situation where the difference matters?
> What does "matters" mean?
By "matters" I mean that the difference is reflected in a different
behavior for "the end user". I'm sure you know what I mean.
> Evidently it does not matter much to you.
Not until I see that it has some more serious consequence. What you
show is a mostly cosmetic difference.
>> Usually we handle the absence of a text property as synonym to a nil
>> value of that property.
> Yes, I know that. And this is a good example where it makes
> a difference.
If you accept the fact that "nothing == nil" for text-properties, then
the difference you show is indeed not a difference, it's just
a cosmetically different way to represent the same state.