[Urwid] Bug or improper usage?

[Ian Ward]

On Tue, 2008-03-11 at 10:56 -0400, Ian Ward wrote:
> Sascha Silbe wrote:
> >    File "/usr/lib/python2.4/site-packages/urwid/util.py", line 566, in
> > calc_line_pos
> >      if closest_sc is None or ( abs(pref_col-current_sc)
> > TypeError: unsupported operand type(s) for -: 'NoneType' and 'int'
> > 
> 
> Hi Sascha,
> 
> It looks like a bug.  pref_col (Urwid's attempt to maintain a preferred
> column when moving the cursor up and down between widgets) has been
> really hard to get right.  I'll look at this tonight.

This was fixed in the svn version, but you can apply the same patch to
0.9.8.1 (and probably earlier releases):

http://excess.org/urwid/changeset/168

I should put out another bugfix release with this fix included.
Ian