Re: \center-column sometimes appears not to reserve space.

[Alexander Kobel]

On 2010-12-19 13:26, Phil Holmes wrote:
> "Reinhold Kainhofer" <address@hidden> wrote in message
> news:address@hidden
> > Am Mittwoch, 15. Dezember 2010, um 15:43:42 schrieb David Kastrup:
> > > It would appear that the middle column has no horizontal size at all.
> > > I think that's a regression in comparison to the last stable version.
> >
> > Nope, no regression, it was also broken in 2.12.3
>
> I've slightly lost track of this. Bug or no Bug?

I'd say "no bug", but the whole range of horizontal alignment commands 
sometimes yield quite surprising output (from the user's POV; formally, 
it's fine).  IIUC, a center or right alignment implies a negative left 
x-extent value, which gives funny results with concat.
I dimly remember that Reinhold once tried to change this.  (It'd be a 
lot easier to understand for the user if the left extent started at 0). 
 But he recognized that this will affect a large number of small tweaks 
and features, like compound time signatures, and he decided to drop the 
idea.  Might be interesting for GLISS, though.


Cheers,
Alexander