Re: strange stretching with \blank[...]

[Hans Hagen <pragma@wxs.nl>]

� wrote:

>Hello,
>
>please consider the following example file:
>
>\setupalign[line]
>\starttext
>\input knuth
>\blank[big]
>\input knuth
>\blank[2*big] % 2*big is much smaller than simple big !
>\input knuth
>\placetable{bla}{\vbox to 18cm{bla}}
>\stoptext
>
>But \blank[big,big] is working right.
>
>It seems, that we should replace all "2*big" by "big,big" in core-sec.tex
>  
>
no, this is a bug! (qualifies for stupid bug of the year)

in core-spa you will find:

% happens often, so we speed this up:

\defineblankmethod    [2*\v!line] 
{\addblankskip+{2\openlineheight}{2\openlineheight}}
\defineblankmethod     [2*\v!big] {\addblankskip+{2\bigskipamount 
}{2\openlineheight}}

comment those two lines!  multiplication makes the stretch/shrink 
disappear (this is a tex feature and i should have know better)

you can test the current situation with:

\def\addblankskip#1#2#3%
  {before:\the\blankskip\endgraf
   \global\advance\blankskip#1\ifgridsnapping#3\else#2\fi
   after:\the\blankskip\endgraf}

test \blank[big]
test \blank[big,big]
test \blank[2*big]

I'll patch it.

Hans