Re: revising documentation for proportional spacing

[Jean Abou Samra]

> While revising the documentation for proportional spacing in the NR I
> stumbled upon
> 
> ```
> \override PaperColumn.used = ##t
> ```
> 
> that gets mentioned without any explanation.  Looking up some
> discussion in `lilypond-user` from 2006
> 
>   https://lists.gnu.org/archive/html/lilypond-user/2006-12/msg00107.html
> 
> it seems that it was necessary then.  However, the examples given in
> these e-mails seem to work just fine with 2.25.13 if I omit setting
> the `used` property.
> 
> Does anybody know more?  Can someone confirm this observation?



I see in Spacing_engraver::stop_translation_timestep():


  SCM proportional = get_property (this, "proportionalNotationDuration");
  if (unsmob<Moment> (proportional))
    {
      set_property (musical_column, "shortest-playing-duration", proportional);
      set_property (musical_column, "shortest-starter-duration", proportional);
      set_property (musical_column, "used", SCM_BOOL_T);
      return;
    }


so it looks like you can remove it.

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