On Nov 7, 2016, at 10:46 , Richard Charles <rcharles...@gmail.com> wrote:
> 
> This is exactly the same as before but it now works!

Regarding that particular mystery, NSChangeUndone decrements the change count. 
If it happened to be 1 when you tried this, the document would stop being 
dirty. Presumably, in your first test, the change count was greater than 1. As 
Jens said, the third test was invalid.

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