a way to implement \testcolumn in mixedcolumns

a way to implement \testcolumn in mixedcolumns

[Lars Huttar]

Hello,

On this list I've been advised that mixedcolumns is the latest and
greatest implementation of columns; the one to use. We have switched
over from columnsets to mixedcolumns, and have been very pleased with
the column balancing (for some reason we couldn't get column balancing
to work in columnsets).

However one thing we do miss from columnsets is the control over widows
& orphans in two ways: \testcolumn, and \setupcolumnsetlines.
\testcolumn[n] allowed us to do a conditional column break, so when we
were about to start a new subsection heading, we could prevent it being
an orphan at the bottom of the column; and when starting a paragraph
with a hangaround graphic framed flushright and bottom, we could
similarly use \testcolumn to prevent the graphic from hanging down into
the footer (which is what sometimes happened otherwise).

So I'm wondering, is there some way to achieve the equivalent of
\testcolumn in mixedcolumns?

Is it theoretically impossible to implement this in mixedcolumns because
the required information (how many lines are left in the current column)
is not yet known?
Or could that information be gleaned from somewhere?

I see in page-brk.mkiv the following definition for \testcolumn:

\def\testcolumn
  {\dodoubleempty\page_tests_columns_test}

\def\page_tests_columns_test[#1][#2]%
  {\endgraf
   \ifdim\pagegoal<\maxdimen
     \ifdim\pagetotal<\pagegoal
       \d_page_tests_test\dimexpr
         \pagegoal
        -\pagetotal
         \ifdim\lastskip<\parskip+\parskip\fi
         \ifsecondargument+#2\fi
       \relax
       \getrawnoflines\d_page_tests_test % (raw)
       \ifnum#1>\noflines
         \column
       \fi
     \else
       \penalty-\plustenthousand % (untested)
     \fi
   \fi}


I'm not a low-level TeX programmer, and I don't understand a lot of
this, but it looks like
  \getrawnoflines\d_page_tests_test
puts the number of remaining lines into \noflines

Any suggestions are appreciated.
(And I should have a MWE soon.)

Lars

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___________________________________________________________________________________

Re: a way to implement \testcolumn in mixedcolumns

[Lars Huttar]

On 11/20/2013 4:47 PM, Lars Huttar wrote:
> However one thing we do miss from columnsets is the control over widows
> & orphans in two ways: \testcolumn, and \setupcolumnsetlines.
> \testcolumn[n] allowed us to do a conditional column break, so when we
> were about to start a new subsection heading, we could prevent it being
> an orphan at the bottom of the column; and when starting a paragraph
> with a hangaround graphic framed flushright and bottom, we could
> similarly use \testcolumn to prevent the graphic from hanging down into
> the footer (which is what sometimes happened otherwise).
>
> So I'm wondering, is there some way to achieve the equivalent of
> \testcolumn in mixedcolumns?

Here is a MWE:

\starttext


\startmixedcolumns[distance=5mm, balance=yes]

\dorecurse {20} {

\testcolumn[8]

\subsection{Subsection Heading} \input knuth \endgraf

}

\stopmixedcolumns


\stoptext


You can see that the heading for subsection 6 is an orphan at the bottom
of a column (at least, with the paper size settings I have; otherwise,
I'm sure it happens somewhere else). If \testcolumn worked, the
\testcolumn[8] would have shoved the subsection heading to the next
column, because there was not space for 8 lines left in the column at
that point.

Any thoughts on how to fix this kind of occurrence?

Thanks,
Lars

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___________________________________________________________________________________

Re: a way to implement \testcolumn in mixedcolumns

[Hans Hagen]

On 11/20/2013 11:12 PM, Lars Huttar wrote:
> On 11/20/2013 4:47 PM, Lars Huttar wrote:
>> However one thing we do miss from columnsets is the control over widows
>> & orphans in two ways: \testcolumn, and \setupcolumnsetlines.
>> \testcolumn[n] allowed us to do a conditional column break, so when we
>> were about to start a new subsection heading, we could prevent it being
>> an orphan at the bottom of the column; and when starting a paragraph
>> with a hangaround graphic framed flushright and bottom, we could
>> similarly use \testcolumn to prevent the graphic from hanging down into
>> the footer (which is what sometimes happened otherwise).
>>
>> So I'm wondering, is there some way to achieve the equivalent of
>> \testcolumn in mixedcolumns?

for the moment add \penalty10000

> Here is a MWE:
>
> \starttext
>
>
> \startmixedcolumns[distance=5mm, balance=yes]
>
> \dorecurse {20} {
>
> \testcolumn[8]
>
> \subsection{Subsection Heading} \input knuth \endgraf
>
> }
>
> \stopmixedcolumns
>
>
> \stoptext
>
>
> You can see that the heading for subsection 6 is an orphan at the bottom
> of a column (at least, with the paper size settings I have; otherwise,
> I'm sure it happens somewhere else). If \testcolumn worked, the
> \testcolumn[8] would have shoved the subsection heading to the next
> column, because there was not space for 8 lines left in the column at
> that point.
>
> Any thoughts on how to fix this kind of occurrence?
>
> Thanks,
> Lars
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
> archive  : http://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________
>


-- 

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
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___________________________________________________________________________________

Re: a way to implement \testcolumn in mixedcolumns

[Lars Huttar]

On 11/22/2013 4:59 PM, Hans Hagen wrote:
> On 11/20/2013 11:12 PM, Lars Huttar wrote:
>> On 11/20/2013 4:47 PM, Lars Huttar wrote:
>>> However one thing we do miss from columnsets is the control over widows
>>> & orphans in two ways: \testcolumn, and \setupcolumnsetlines.
>>> \testcolumn[n] allowed us to do a conditional column break, so when we
>>> were about to start a new subsection heading, we could prevent it being
>>> an orphan at the bottom of the column; and when starting a paragraph
>>> with a hangaround graphic framed flushright and bottom, we could
>>> similarly use \testcolumn to prevent the graphic from hanging down into
>>> the footer (which is what sometimes happened otherwise).
>>>
>>> So I'm wondering, is there some way to achieve the equivalent of
>>> \testcolumn in mixedcolumns?
>
> for the moment add \penalty10000
>

OK... where? In the same place we used to use \testcolumn?

According to http://www.tug.org/utilities/plain/cseq.html#penalty-rp,
"If <number> is 10,000 or larger, TeX will never break a line or a page
there. Also, if <number> is -10,000 or less, it will always break a line
or a page there [97 and 110]. ... Plain TeX has \break and \nobreak
macros which are defined to be: \penalty-10000 and \penalty10000."

So it sounds like you're recommending the equivalent of a \nobreak. That
wouldn't make sense in the place where we want to conditionally break
the column. So I guess you're talking about using it e.g. right after
the subsection heading, since we don't want it to break right there?

If so, that sounds like it will be helpful for preventing that
particular case.

I don't think it will work for preventing external figures from hanging
down below the bottom of the column though, will it? Because for that to
work, we'd have to prevent breaks anywhere in the flowing-around
paragraph. And I don't see a way to do that.

Thanks,
Lars

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___________________________________________________________________________________

Re: a way to implement \testcolumn in mixedcolumns

[Hans Hagen]

On 11/22/2013 11:37 PM, Lars Huttar wrote:
> On 11/22/2013 4:59 PM, Hans Hagen wrote:
>> On 11/20/2013 11:12 PM, Lars Huttar wrote:
>>> On 11/20/2013 4:47 PM, Lars Huttar wrote:
>>>> However one thing we do miss from columnsets is the control over widows
>>>> & orphans in two ways: \testcolumn, and \setupcolumnsetlines.
>>>> \testcolumn[n] allowed us to do a conditional column break, so when we
>>>> were about to start a new subsection heading, we could prevent it being
>>>> an orphan at the bottom of the column; and when starting a paragraph
>>>> with a hangaround graphic framed flushright and bottom, we could
>>>> similarly use \testcolumn to prevent the graphic from hanging down into
>>>> the footer (which is what sometimes happened otherwise).
>>>>
>>>> So I'm wondering, is there some way to achieve the equivalent of
>>>> \testcolumn in mixedcolumns?
>>
>> for the moment add \penalty10000
>>
>
> OK... where? In the same place we used to use \testcolumn?

just after the (sub)section title

i need time to figure out this kind of things in the balancer

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: a way to implement \testcolumn in mixedcolumns

[Lars Huttar]

On 11/23/2013 6:49 AM, Hans Hagen wrote:
> On 11/22/2013 11:37 PM, Lars Huttar wrote:
>> On 11/22/2013 4:59 PM, Hans Hagen wrote:
>>> On 11/20/2013 11:12 PM, Lars Huttar wrote:
>>>> On 11/20/2013 4:47 PM, Lars Huttar wrote:
>>>>> However one thing we do miss from columnsets is the control over
>>>>> widows
>>>>> & orphans in two ways: \testcolumn, and \setupcolumnsetlines.
>>>>> \testcolumn[n] allowed us to do a conditional column break, so
>>>>> when we
>>>>> were about to start a new subsection heading, we could prevent it
>>>>> being
>>>>> an orphan at the bottom of the column; and when starting a paragraph
>>>>> with a hangaround graphic framed flushright and bottom, we could
>>>>> similarly use \testcolumn to prevent the graphic from hanging down
>>>>> into
>>>>> the footer (which is what sometimes happened otherwise).
>>>>>
>>>>> So I'm wondering, is there some way to achieve the equivalent of
>>>>> \testcolumn in mixedcolumns?
>>>
>>> for the moment add \penalty10000
>>>
>>
>> OK... where? In the same place we used to use \testcolumn?
>
> just after the (sub)section title
>
> i need time to figure out this kind of things in the balancer

Hans, here is what I tried (MWE):

\setuppapersize[A4]

\starttext

\section{Introduction}

\startmixedcolumns[distance=5mm, balance=yes]

\dorecurse {25} {

\subsection{Subsection Heading}

\penalty10000

If I had not participated fully in all these activities, literally
hundreds of improvements would never have been made, because I would
never have thought of them or perceived their importance. \endgraf

}

\stopmixedcolumns

\stoptext


As you see, I tried \penalty10000 after the subsection heading.
But in the resulting PDF, on page 3, in the left column, we see a
subsection heading at the bottom of the column with nothing below it. So
something didn't work.

Am I not doing it the way you meant?


Thanks for your help,
Lars

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___________________________________________________________________________________

Re: a way to implement \testcolumn in mixedcolumns

[Hans Hagen]

On 11/20/2013 10:47 PM, Lars Huttar wrote:
> Hello,
>
> On this list I've been advised that mixedcolumns is the latest and
> greatest implementation of columns; the one to use. We have switched
> over from columnsets to mixedcolumns, and have been very pleased with
> the column balancing (for some reason we couldn't get column balancing
> to work in columnsets).
>
> However one thing we do miss from columnsets is the control over widows
> & orphans in two ways: \testcolumn, and \setupcolumnsetlines.
> \testcolumn[n] allowed us to do a conditional column break, so when we
> were about to start a new subsection heading, we could prevent it being
> an orphan at the bottom of the column; and when starting a paragraph
> with a hangaround graphic framed flushright and bottom, we could
> similarly use \testcolumn to prevent the graphic from hanging down into
> the footer (which is what sometimes happened otherwise).
>
> So I'm wondering, is there some way to achieve the equivalent of
> \testcolumn in mixedcolumns?
>
> Is it theoretically impossible to implement this in mixedcolumns because
> the required information (how many lines are left in the current column)
> is not yet known?
> Or could that information be gleaned from somewhere?
>
> I see in page-brk.mkiv the following definition for \testcolumn:
>
> \def\testcolumn
>    {\dodoubleempty\page_tests_columns_test}
>
> \def\page_tests_columns_test[#1][#2]%
>    {\endgraf
>     \ifdim\pagegoal<\maxdimen
>       \ifdim\pagetotal<\pagegoal
>         \d_page_tests_test\dimexpr
>           \pagegoal
>          -\pagetotal
>           \ifdim\lastskip<\parskip+\parskip\fi
>           \ifsecondargument+#2\fi
>         \relax
>         \getrawnoflines\d_page_tests_test % (raw)
>         \ifnum#1>\noflines
>           \column
>         \fi
>       \else
>         \penalty-\plustenthousand % (untested)
>       \fi
>     \fi}
>
>
> I'm not a low-level TeX programmer, and I don't understand a lot of
> this, but it looks like
>    \getrawnoflines\d_page_tests_test
> puts the number of remaining lines into \noflines
>
> Any suggestions are appreciated.
> (And I should have a MWE soon.)

That macro was never meant for mixed columns. I made a variant that 
works ok in mixed columns which will be in the next beta.

\setuptolerance[verytolerant]

\starttext

\startmixedcolumns

     \dorecurse{4}{\input ward \par}

     \testcolumn[10][-1pt] % 10 lines - 1pt slack

     \dorecurse{2}{\input ward \par}

\stopmixedcolumns

\stoptext




-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________

Re: a way to implement \testcolumn in mixedcolumns

[Lars Huttar (SIL gmail)]

On 11/28/2013 1:34 PM, Hans Hagen wrote:
>
> That macro was never meant for mixed columns. I made a variant that
> works ok in mixed columns which will be in the next beta.
>

Excellent. I will give it a try.
I see a context-setup-win64 dated 2013-11-28 19:45. Is that beta? I may
wait for the next one anyway just to be sure... today is a holiday for us.

Lars

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___________________________________________________________________________________

Re: a way to implement \testcolumn in mixedcolumns

[Hans Hagen]

On 11/29/2013 12:26 PM, Lars Huttar (SIL gmail) wrote:
> On 11/28/2013 1:34 PM, Hans Hagen wrote:
>>
>> That macro was never meant for mixed columns. I made a variant that
>> works ok in mixed columns which will be in the next beta.
>>
>
> Excellent. I will give it a try.
> I see a context-setup-win64 dated 2013-11-28 19:45. Is that beta? I may
> wait for the next one anyway just to be sure... today is a holiday for us.

you can just update with the already installed first-setup script (no 
need to do a new install)

Hans

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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
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___________________________________________________________________________________

Re: a way to implement \testcolumn in mixedcolumns

[Lars Huttar]

On 11/28/2013 1:34 PM, Hans Hagen wrote:
>
> That macro was never meant for mixed columns. I made a variant that
> works ok in mixed columns which will be in the next beta.
>
> \setuptolerance[verytolerant]
>
> \starttext
>
> \startmixedcolumns
>
>     \dorecurse{4}{\input ward \par}
>
>     \testcolumn[10][-1pt] % 10 lines - 1pt slack
>
>     \dorecurse{2}{\input ward \par}
>
> \stopmixedcolumns
>
> \stoptext

Ok. It looks like the second parameter to \testcolumn is now required
(it didn't used to be).
What does this slack value do? Does it mean that the minimum amount of
space left in the column is 10 lines minus 1pt?

Also, in the Dec. 2 beta (current version: 2013.12.02 15:22),  the
\column command now causes an error when we come to the \stopmixedcolumns.
I don't know if it's connected with the above change, or something else.

MWE: change the \testcolumn command above to \column.
I get the following error output:

! LuaTeX error
C:/context/tex/texmf-context/tex/context/base/page-mix.lua:474
: attempt to compare number with nil
stack traceback:
   
C:/context/tex/texmf-context/tex/context/base/page-mix.lua
:474: in function 'process_penalty'
   
C:/context/tex/texmf-context/tex/context/base/page-mix.lua
:572: in function 'setsplit'
   
C:/context/tex/texmf-context/tex/context/base/page-mix.lua
:687: in function 'setsplit'
   
C:/context/tex/texmf-context/tex/context/base/page-mix.lua
:819: in function 'mixsetsplit'
    [string "\directlua "]:1: in main chunk.

system          > tex > error on line 14 in file
C:/Users/Huttar/Documents/work/tex/test-beta-testcolumn.tex:
LuaTeX error  ...

 4    
 5     \startmixedcolumns
 6    
 7         \dorecurse{4}{\input ward \par}
 8    
 9         %\testcolumn[10][-1pt] % 10 lines - 1pt slack
10         \column
11    
12         \dorecurse{2}{\input ward \par}
13    
14 >>  \stopmixedcolumns
15    
16     \stoptext
17    


\ctxcommand #1 -\directlua {commands.#1}
                                       
\page_mix_routine_construct ...\else false\fi , }}
                                                  \deadcycles
\zerocount
\page_mix_routine_continue ...ine_construct \v!no
                                                 
\page_mix_routine_package ...
\page_otr_command_routine ...mix_routine_continue
                                                  \or
\page_mix_routine_bala...
\page_otr_triggered_output_routine ...and_routine
                                                  \fi
<output> ...eforeoutput \page_otr_triggered_output_routine
                                                  \relax \the
\everyafterout...
...
l.14 \stopmixedcolumns
                   
? X


Thanks again for your work on this.
We're continually reevaluating whether we can use the beta or need to
stick with the stable version. At the moment, it looks like we'll be
sticking with the stable version. But we'd like to use the beta, if the
problems can be ironed out.

Lars

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___________________________________________________________________________________

Re: a way to implement \testcolumn in mixedcolumns

[Hans Hagen]

On 12/3/2013 3:10 PM, Lars Huttar wrote:
> On 11/28/2013 1:34 PM, Hans Hagen wrote:
>>
>> That macro was never meant for mixed columns. I made a variant that
>> works ok in mixed columns which will be in the next beta.
>>
>> \setuptolerance[verytolerant]
>>
>> \starttext
>>
>> \startmixedcolumns
>>
>>      \dorecurse{4}{\input ward \par}
>>
>>      \testcolumn[10][-1pt] % 10 lines - 1pt slack
>>
>>      \dorecurse{2}{\input ward \par}
>>
>> \stopmixedcolumns
>>
>> \stoptext
>
> Ok. It looks like the second parameter to \testcolumn is now required
> (it didn't used to be).

i'll fix that

> What does this slack value do? Does it mean that the minimum amount of
> space left in the column is 10 lines minus 1pt?

indeed

> Also, in the Dec. 2 beta (current version: 2013.12.02 15:22),  the
> \column command now causes an error when we come to the \stopmixedcolumns.
> I don't know if it's connected with the above change, or something else.

no, more to making section breaks working better in columns (i forgot to 
rename a variable)

> MWE: change the \testcolumn command above to \column.
> I get the following error output:
>
> ! LuaTeX error
> C:/context/tex/texmf-context/tex/context/base/page-mix.lua:474
> : attempt to compare number with nil
> stack traceback:
>
> C:/context/tex/texmf-context/tex/context/base/page-mix.lua
> :474: in function 'process_penalty'
>
> C:/context/tex/texmf-context/tex/context/base/page-mix.lua
> :572: in function 'setsplit'
>
> C:/context/tex/texmf-context/tex/context/base/page-mix.lua
> :687: in function 'setsplit'
>
> C:/context/tex/texmf-context/tex/context/base/page-mix.lua
> :819: in function 'mixsetsplit'
>      [string "\directlua "]:1: in main chunk.
>
> system          > tex > error on line 14 in file
> C:/Users/Huttar/Documents/work/tex/test-beta-testcolumn.tex:
> LuaTeX error  ...
>
>   4
>   5     \startmixedcolumns
>   6
>   7         \dorecurse{4}{\input ward \par}
>   8
>   9         %\testcolumn[10][-1pt] % 10 lines - 1pt slack
> 10         \column
> 11
> 12         \dorecurse{2}{\input ward \par}
> 13
> 14 >>  \stopmixedcolumns
> 15
> 16     \stoptext
> 17
>
>
> \ctxcommand #1 -\directlua {commands.#1}
>
> \page_mix_routine_construct ...\else false\fi , }}
>                                                    \deadcycles
> \zerocount
> \page_mix_routine_continue ...ine_construct \v!no
>
> \page_mix_routine_package ...
> \page_otr_command_routine ...mix_routine_continue
>                                                    \or
> \page_mix_routine_bala...
> \page_otr_triggered_output_routine ...and_routine
>                                                    \fi
> <output> ...eforeoutput \page_otr_triggered_output_routine
>                                                    \relax \the
> \everyafterout...
> ....
> l.14 \stopmixedcolumns
>
> ? X
>
>
> Thanks again for your work on this.
> We're continually reevaluating whether we can use the beta or need to
> stick with the stable version. At the moment, it looks like we'll be
> sticking with the stable version. But we'd like to use the beta, if the
> problems can be ironed out.

fyi: i'll not patch the stable version

new beta

> Lars
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
> archive  : http://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________
>


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Re: a way to implement \testcolumn in mixedcolumns

[Lars Huttar (SIL gmail)]

On 12/3/2013 4:40 PM, Hans Hagen wrote:
> On 12/3/2013 3:10 PM, Lars Huttar wrote:
>> ...
>> Thanks again for your work on this.
>> We're continually reevaluating whether we can use the beta or need to
>> stick with the stable version. At the moment, it looks like we'll be
>> sticking with the stable version. But we'd like to use the beta, if the
>> problems can be ironed out.
>
> fyi: i'll not patch the stable version
>
> new beta
>

Thanks for the fixes.
When I said "the stable version", I wasn't very specific, but I was
referring to the one on the TeX Live 2013 CD.

But after you said the above I realized you were talking about this
(http://wiki.contextgarden.net/ConTeXt_Standalone#Single_user_installation):

> By default, the suite installs ConTeXt beta. If you want the stable
> version of ConTeXt, you can use
>
> sh ./first-setup.sh --context=current

I'm making a note of it here in hope that it will help me remember next
time what the "stable" version refers to.

Regards,
Lars

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