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

[Stefan Monnier]

severity 9159 minor
thanks

> 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?
Usually we handle the absence of a text property as synonym to a nil
value of that property.


        Stefan