Hi Mikael,

The explanation and the solution given by Henri works fine here. The code below 
gives the attached PDF (with ConTeXt 2016.09.12 18:27 MKIV beta). The point is 
that an empty \item does not allow to begin a new level of itemization. 

Best regards: OK
%%% begin
\starttext
\startitemize[n]
\item \blank[-line]
\startitemize[a,horizontal,two]
\startitem First \stopitem
\startitem Second \stopitem
\startitem Third \stopitem
\startitem Fourth \stopitem
\stopitemize
\item % Here with a blank line
\blank[small]
\startitemize[a,horizontal,two]
\startitem First \stopitem
\startitem Second \stopitem
\startitem Third \stopitem
\startitem Fourth \stopitem
\stopitemize
\item On the outer level

\stopitemize
\stoptext
%%% end

Attachment: itemize-horizontal.pdf
Description: Adobe PDF document


> On 19 Sep 2016, at 13:27, Mikael P. Sundqvist <mic...@gmail.com> wrote:
> 
> On Sun, Sep 18, 2016 at 9:56 PM, Henri Menke <henrime...@gmail.com> wrote:
>> You can start itemize only in vertical mode.  To switch to vertical mode use 
>> \blank.  To kill the empty line which is inserted use \blank[-line].
>> 
>> \starttext
>> \startitemize[n]
>> \item \blank[-line]
>> \startitemize[a,horizontal,three]
>> \startitem First \stopitem
>> \startitem Second \stopitem
>> \startitem Third \stopitem
>> \startitem Fourth \stopitem
>> \stopitemize
>> \item On the outer level
>> \stopitemize
>> \stoptext
>> 
>> On 09/18/2016 10:54 AM, Mikael P. Sundqvist wrote:
>>> Hi
>>> 
>>> 1) the following code
>>> 
>>> \starttext
>>> \startitemize[n]
>>> \item
>>> \startitemize[a,horizontal,three]
>>> \startitem First \stopitem
>>> \startitem Second \stopitem
>>> \startitem Third \stopitem
>>> \startitem Fourth \stopitem
>>> \stopitemize
>>> \item On the outer level
>>> \stopitemize
>>> \stoptext
>>> 
>>> generates the error
>>> 
>>> tex error       > tex error on line 9 in file
>>> /home/mickep/tmp/ctx-listexample14.tex: ! You can't use `\prevdepth'
>>> in restricted horizontal mode
>>> 
>>> Isn't it possible to have nested itemize with key horizontal?
>>> 
>>> 2) If I change the horizontal key to columns, then there is an extra
>>> line (the extra line in nested itemization has been discussed before,
>>> but not with these keys given, as far as I could see). I.e. the file
>>> 
>>> \starttext
>>> \startitemize[n]
>>> \item
>>> \startitemize[a,columns,three]
>>> \startitem First \stopitem
>>> \startitem Second \stopitem
>>> \startitem Third \stopitem
>>> \startitem Fourth \stopitem
>>> \stopitemize
>>> \item On the outer level
>>> \stopitemize
>>> \stoptext
>>> 
>>> gives the attached pdf file, where I would have exptected the first a.
>>> in the inner itemize to be on the same line as the 1. in the outer
>>> itemize.
>>> 
>>> Anyone has an idea on what is going on here?
>>> 
>>> Best regards, Mikael
>>> 
>>> 
>>> 
>>> ___________________________________________________________________________________
>>> 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
>>> ___________________________________________________________________________________
>>> 
>> 
>> ___________________________________________________________________________________
>> 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
>> ___________________________________________________________________________________
> 
> 
> Thank you Henri, that works, and I can live with adding \blank[-line]
> in these cases.
> 
> I still wonder if there is an automatic way, since it seems to only
> happen when one has the inner itemize in columns. For example, with
> 
> \starttext
> \startitemize[n]
> \item
> \startitemize[a]
> \startitem First \stopitem
> \startitem Second \stopitem
> \startitem Third \stopitem
> \startitem Fourth \stopitem
> \stopitemize
> \item On the outer level
> \stopitemize
> \stoptext
> 
> there is no extra line (result is attached).
> 
> /Mikael
> <ctx-listexample14.pdf>___________________________________________________________________________________
> 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
> ___________________________________________________________________________________

___________________________________________________________________________________
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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