[Urwid] Bug or improper usage?

[Ian Ward]

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.

Ian