# Re: [NTG-context] Strange bug with reversed itemize

On Fri, 14 Sep 2012, Wolfgang Schuster wrote:





I have been able to isolate the bug to the update on 2012.07.09; specifically
to this commit.

If I replace the current version of strc-num.mkiv with the version from
2012.07.09:
http://repo.or.cz/w/context.git/blob_plain/6f124794f7dc253f8b83f2517c26ce17e50d66ff:/tex/context/base/strc-num.mkiv

then the numbering is correct.

However, I cannot figure out what is causing the bug in that change.


Part of the problem is this code block:

\def\strc_counters_check_setup#1% does it have to happen here?
{% this can be done at the lua end / a bit messy here ... todo ...
\ifcsname\??counter#1\c!number\endcsname
\doifelsevalue   {\??counter#1\c!number}{#1}
{\letbeundefined{\??counter#1\c!number}}%
{\doifvaluenothing{\??counter#1\c!number}
{\letbeundefined{\??counter#1\c!number}}}%
\fi
\ifcsname\??counter#1\c!number\endcsname
% it's a clone
\else
\edef\currentcounterlevel{\thenamedcounterlevel{#1}}%
\edef\p_start{\counterparameter{#1}\c!start}%

\ctxcommand{checkcountersetup("#1",\currentcounterlevel,\ifx\p_start\empty0\else\number\p_start\fi,"\counterparameter{#1}\c!state")}%
\fi}

ConTeXt uses \p_start to store the current value of the start parameter.
When you set now a value for start in \setuppagenumber the value is kept
in \p_start (because there are no groups). When you start now the itemize
environment the same code is loaded and the start parameter (which hasn’t
been set yet) expands to a very stupid default value which is by another
helper function.

\def\strc_counter_setup_using_parameter#1#2% name \someparameter
{\edef\p_start{#2\c!start}%
\setupcounter
[#1]
[              \c!start=\ifx\p_start\empty0\else\number\p_start\fi,
...
\c!numbersegments=#2\c!numbersegments]}

As you can see here the start parameter expands to \p_start when it isn’t empty
what is the case here and because of this you get a wrong value for the item
numbers.



Thanks for the diagnosis. What will be a good way to fix this? I think that

\expanded{\setupcounter[#1][\c!start=\ifx\p_start\empty0\else\number\p_start\fi.,...]}

should work (but I haven't tested it yet).

Aditya
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