Re: [NTG-context] bug in latest beta?

1 Jun 2015

      Hi Pablo,

Indeed the document I was talking about has been typeset with various versions of mkiv, but now I observe that sometimes the pagebreaks are made in a very strange way. Since I can’t make a minimal example, I put on the following link an excerpt of the PDF document where the bad pagebreaks can be seen: 

	https://dl.dropboxusercontent.com/u/4316076/bad-pagebreak.pdf

(Please see pages 19 and 32). It seems that this happens, sometimes, but as far as I can say from my experiments the bad pagebreak happens always before a « proclaim » which is defined as follows:

\defineenumeration[proclaim]
	[text=,
	before={\blank\startbackground[frame=off,leftframe=on,
				rulethickness=2pt,framecolor=darkred,
				background=color,
				backgroundcolor=screen]},
	after={\stopbackground\blank},
	style=slanted,
	title=yes,
	titleleft=,
	titleright={.},
	alternative=hanging,
	width=fit,
	right={~},
	way=bysection,
	prefix=yes,
	prefixsegments={chapter:section}]

Actually I found a workaround for this by changing the above definition into:

\defineenumeration[proclaim]
	[text=,
	before={\blank\startmarginrule[rulethickness=1pt,rulecolor=darkred]},
	after={\stopmarginrule},
	style=slanted,
	title=yes,
	titleleft=,
	titleright={.},
	alternative=hanging,
	width=fit,
	right={~},
	way=bysection,
	prefix=yes,
	prefixsegments={chapter:section}]

However it would be better to understand why the first definition does not work properly, in a rather random way.

Best regards: OK
...
On 01 Jun 2015, at 00:16, Hans Hagen  wrote:
On 5/31/2015 1:56 PM, Pablo Rodriguez wrote:
...
On 05/28/2015 07:10 PM, Hans Hagen wrote:
...
On 5/27/2015 10:38 PM, Pablo Rodriguez wrote:
...
[...]
Compiling it with beta from 2015.03.25 22:13, page break is fine.
But with latest beta from 2015.05.24 12:42 (or even with beta from
2015.05.15 11:42 includes a wrong page break. The setups for widow and
orphan lines move the two last lines to the next page.
Could anyone confirm this bug?
i wonder if it's a bug or just tex's decision ... you can use
\showmakeup[penalty]
and see what penalties get injected
are the linebreaks identical, i.e. same hyphenation?
Many thanks for your reply, Hans.
Hyphenation is the same in both documents.
...
btw, brokenpenalty 1 gives a different result
Page break is wrong when any of the three values (brokenpenalty,
widowpenalty or clubpenalty) is 0 or above 9999.
I replacing \subsection with \section gives the right page break:
\showframe\showgrid
    \setuplayout[setups=*lessstrict]
    \startsetups[*lessstrict]
        \setup[reset]
        \widowpenalty=10000
        \clubpenalty=10000
        \brokenpenalty=0
    \stopsetups
    \setupbodyfont[pagella, 12.6pt]
    \starttext
    \chapter{Quotes}
    \section{Zapf}
    \dorecurse{4}{\input zapf\par}
    \section{Knuth}
    \input knuth
    \stoptext
Why does \subsection cause a different page break than \section?
because there are penalties related to (sub)sections in a way that keeps them together but at the same time still permits breaks in case of too many successive ones .. and penalties determine the way the page is broken
Hans
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Re: [NTG-context] bug in latest beta?

Otared Kavian