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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, 2 Aug 2011 13:48:03 -0700
> >> > 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.
I _described_ a visible difference for the end user. That is pretty much the
only things I care about in general: user-visible behavior.
What is not user-visible in the behavior I reported? The whole point of the
report was about the behavior being confusing to an end user.
> > 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.
Call it such a name if that makes you feel better.
It is a user-visible difference that promotes confusion.
No, it is not the most important problem Emacs has.
And it is unlikely to cause mass destruction.
> >> 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.
A user-visible difference, I might have added.
> 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.
Whatever. If you don't think this difference in what the user sees and what
s?he is likely to expect/understand promotes confusion, or if you see it but
don't care, nothing I say will change your mind.
I already said in the OP that "while correct" (N.B.) "it would be better for the
property `foo' to simply be removed."
We agree that the value shown is correct. I say that although correct it is
confusing. You say that it's just cosmetic - bad looks. Your poor cosmetics
can confuse users. And that was the point, from the beginning.