Re: Odd Behavior in pdftex/xetex

[Wolfgang Schuster <schuster.wolfgang@googlemail.com>]

On Fri, 23 May 2008 22:29:06 +0200
Hans Hagen <pragma@wxs.nl> wrote:

> Michael.Urban@jpl.nasa.gov wrote:
> > The following specimen was run on live.contextgarden.net with each of
> > the three typesetters:
> > 
> > \setupcolors[state=start]
> > \starttext
> > \input knuth
> > 
> > \bTABLE
> > \bTR [align=middle]\bTH Range\eTH{}\bTH Value\eTH{}\eTR
> > \bTR \bTD \type{<} 12\eTD{}\bTD 3\eTD{}\eTR
> > \bTR \bTD 12--16\eTD{}\bTD 2\eTD{}\eTR
> > \bTR \bTD \type{>}16\eTD{}\bTD 1\eTD{}\eTR
> > \eTABLE
> > 
> > \input knuth
> > \stoptext
> > 
> > 
> > In the case of pdfTeX and XeTeX, the table is given a width equal
> > to the textwidth; in the caes of LuaTeX, it is typeset correctly
> > with natural widths.
> > 
> > When \setupcolors is removed, both pdfTeX and XeTeX also produce
> > the correct result.
> > 
> > This sounds like a bug to me (and took me forever to isolate
> > \setupcolors - of all things! - as the culprit).
> 
> actually it's the \type (combined with colors)
> 
> \dontleavehmode \type {xx}
> 
> works ok
> 
> probably some pdfliteral is playing havoc here so that the width analyer 
> cannot function well (a limitation of tex is that there's only a small 
> set subset of \un* and \last* node operations); if you see messages like 
> this
> 
>    !!forced exit from shapebox 9!!
> 
> that is indeed the case. hoewver, in mkiv i use different trickery so 
> there we don't have this problem (we also use a different color 
> mechanism so that helps too)
> 
> it's not so much a bug in mkii as well as a side effect/limitation
> 
> okay, we could add \dontleavehmode to \type but i'm not sure if that 
> will not break other things; also, bTABLE is kind of tricky because it 
> needs to be clever with regards to text and non text and such

If he use \retype the table works.

Wolfgang
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