Re: [NTG-context] \indenting[next] and math => no vertical space before the formula

30 Apr 2008

      On Tue, Apr 29, 2008 at 6:49 AM, Aditya Mahajan  wrote:
...
On Mon, 28 Apr 2008, Mikael Persson wrote:
...
Hello again,
* snip *
...
I could reproduce the result and have also a fix but I don't know what
 the correct
 reults should be and other people like Aditya should decide if it makes sense
 to change the current behaviour.
\def\startdisplaymath
  {\ifgridsnapping
     \beforedisplayspace
     \snapmathtogrid\vbox
* snip *
...
Wolfgang
This fix seems not to solve the problem entirely. With this fix
applied, If one now put a formula inside an enumeration one gets
"double" space before the formula. This is a test file that shows the
problem:
This is basically because in enumerations indenting is set to never.
You can see the same affect with
\setupindenting[no]
 \testtext
One possible fix is to add
indenting=(reset|next|first) %default is never
to the \setupenumeration command. For example
...
\defineenumeration[example]
       [text=Example,
       location=serried,
       width=fit,
          indenting=reset, %%<<<---- Add This
...
distance=0.5em,
      way=bysection,
       ]
Another is to change \startdisplaymath to
\def\startdisplaymath
   {\ifgridsnapping
      \beforedisplayspace
      \snapmathtogrid\vbox
\bgroup
      \informulatrue
     %\forgetall % breaks side floats
    \else
      \bgroup
      \parskip\formulaparskip % ! !
      \informulatrue
     %\forgetall % otherwise backgrounds fail
      \ifdim\lastskip<\zeropoint\else
        \par
        \ifvmode \ifdim\parskip>\zeropoint\relax
          \whitespace \vskip-\parskip % kind of forces and cancels again
        \fi \fi
      \fi
      \doif\displaygridcorrection{-\v!top}{\kern-\strutht}% new, currently only option/default
      \beforedisplayspace
      \par
      \ifvmode \ifdim\parskip>\zeropoint\relax \else
\ifindentfirstparagraph
          \verticalstrut
          \vskip-\struttotal
          \vskip-\baselineskip
        \fi\fi
      \fi
    \fi
    $$\setdisplaydimensions
    \setpredisplaysize\lastlinewidth
    \startinnermath}
But this is getting ugly.
Aditya
Thank you Aditya, but I don't get that to work. Both with

ConTeXt  ver: 2007.04.03 13:01 MKII  fmt: 2008.4.24  int:
english/english (with the fix earlier in this thread)
and
ConTeXt  ver: 2007.09.28 16:52 MKII  fmt: 2008.4.24  int:
english/english (which is the one from new ubuntu, without the fix)

this fails with the following error msg:

%% Start error msg
! Illegal unit of measure (pt inserted).
<to be read again>
                   \chardef
\@@in:reset ...rue \parindent \zerocount \chardef
                                                  \indentingtoggle \zerocount
\next1 #1,->\docomplexsetupindentingB {#1}
                                          \doprocesscommaitem
\doprocesscommalist ...item \gobbleoneargument #1,
                                                  ]\relax \global \advance \...
<argument> ...ndenting ]\docomplexsetupindentingB
                                                  \checkeverypar \ifindentfi...

\firstofoneargument #1->#1

...
l.29 \testexpr
               % Too much space before the formula if the fix is applied,
?
%% Stop error msg

The file that gives that error is:

%% Begin file
\setupindenting[yes,small]
\indenting[next]

\def\testtext{This is just some text so we see better what happens.}

\def\testexpr{%
\par
\testtext
\startformula
f(x)= \sin(x)
\stopformula
\testtext
\par
}

\defineenumeration[example]
       [text=Example,
       location=serried,
       width=fit,
       indenting=reset,
       distance=0.5em,
       way=bysection,
       ]

\starttext
\testexpr % OK if fix is applied, otherwise to little space before the
formula
\startexample
\testexpr % Too much space before the formula if the fix is applied,
otherwise OK.
\stopexample

\stoptext
%% End file

Best regards, Micke P