[Urwid] edit.py example and linebreaks

[Ian Ward]

zeth at zeth.net wrote:
> Okay, enough rambling and on to the question, I have been playing with edit.py 
> example, (and very nice it is too). However, when you have made some text with 
> line breaks, the cursor will not pass through a line break onto the next line. 
> How would I extend the example to fix that?  

Try the attached patch.

Ian
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