[NTG-context] Strange pagebreaks in LMTX

Wolfgang Schuster wolfgang.schuster.lists at gmail.com
Wed Sep 4 18:32:11 CEST 2019


Hans Hagen schrieb am 04.09.2019 um 17:58:
> On 9/4/2019 2:24 PM, Otared Kavian wrote:
>> Hi all,
>>
>> I have a document which typesets correctly in mkiv giving a PDF file 
>> with 7 pages, but the same document typeset with lmtx gives two pages 
>> with a strange pagebreak on the second page. Up to now, 
>> unfortunately, I could not create a minimal example to show this 
>> behaviour, so I put the files in the folder here:
>>
>>     https://www.dropbox.com/sh/7rolmpe47njvy0l/AADmcILO0XgY3Sb6FC2dwMw-a?dl=0 
>>
>>
>> and the PDF file obtained with mkiv is here
>>
>>     https://www.dropbox.com/s/udbz0lulat9vum7/bug-pagebreaks-mkiv.pdf?dl=0 
>>
>>
>> while the one obtained with lmtx is here
>>
>>     https://www.dropbox.com/s/t6kge5lq8otju4y/bug-pagebreaks-lmtx.pdf?dl=0 
>>
>>
>> Also, the TeX file typesets correctly with lmtx, if I don't use 
>> textrules, so  I wonder whether there has been some changes in the 
>> way such textrules have to be used.
>> As far as I can remember, two months ago the same file was typeset 
>> with lmtx without any problem.
>>
>> Thanks in advance for any help,
>> Best regards: OK
> you have some interaction between textrules and backgrounds (and that 
> can be a matter of very small differences in dimensions and rounding 
> and such .. i just don't see a quick way out) ... esp these 
> backgrounds are an old mechanism (maybe i should alias it to 
> textbackgrounds in lmtx)
>
> much better is to use this:
>
> \definetextbackground
>   [xx]
>   [location=paragraph]
>
> \starttextbackground[xx]
> \stoptextbackground
>
> can you try to use that instead? less page overflow too
>
> (actually i should iontegrate some title line in that)
A limitation of textbackgrounds is the limited control over the vertical 
space at page breaks.

With the old background mechanism you get the normal topoffset and 
bottomoffset values
but with textbackgrounds you can just control the space at the end and 
end of the environment.

\showframe[text][text]

\starttext

\dorecurse{3}{\samplefile{knuth}}

\startbackground[topoffset=1em,bottomoffset=1em]
\dorecurse{2}{\samplefile{knuth}}
\stopbackground

\dorecurse{2}{\samplefile{knuth}}

\page

\definetextbackground[xx][location=paragraph,frame=off,background=color,backgroundcolor=gray,topoffset=1em,bottomoffset=1em]

\dorecurse{3}{\samplefile{knuth}}

\starttextbackground[xx]
\dorecurse{2}{\samplefile{knuth}}
\stoptextbackground

\dorecurse{2}{\samplefile{knuth}}

\stoptext

Wolfgang



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