Re: Vertical space around displayed formulas

[Otared Kavian <otared@gmail.com>]

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Hi Hans,

Thanks for your attention which fixed most of the difficulties with vertical distances around math formulas.
However, after typesetting a long document, I noticed that there are still some incorrect behaviours. The following minimal example, extracted from that long document, shows what is wrong: please have a look at the second formula in the attached PDF. (The output with the older version from TeXLIve 2016 is correct).

%% begin vertical-space-bug.tex
\starttext

\input knuth.tex
\startformula
a \leq a_{n+1} \leq a_{n} \leq b_{n+1} \leq b_{n} \leq b, \qquad\mbox{et}\qquad 0 \leq b_{n} - a_{n} \leq 2^{-n}(b_{0} - a_{0}).
\stopformula
\input ward.tex
\startformula
g(x_{*}) = \lim_{n\to\infty} g(a_{n}) \leq 0 \leq \lim_{n\to\infty} g(b_{n}) = g(x_{*}),
\stopformula
\input knuth.tex

\stoptext
%% end vertical-space-bug.tex


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> On 18 Jan 2017, at 19:15, Hans Hagen <pragma@wxs.nl> wrote:
> 
> On 1/18/2017 6:23 PM, Nicola wrote:
>> On 18/01/2017 17:53, Otared Kavian wrote:
>>> Hi Nicola,
>>> 
>>> In fact, if you are in a hurry and don’t use subtle things
>>> introduced  since May 2016, you can use the stable version of ConTeXt
>>> from TeXLive
>>> 2016 (the bug noticed by Mikael, and you, is absent from that version
>>> of ConTeXt).
>> 
>> Thanks, that's what I am doing now. Strangely enough, it fixes the
>> layout for all the slides, *except* the one I have posted before. But
>> that one I can easily fix.
> 
> the current (yesterdays) beta should be ok .. (the midpar flushing of a formula)
> 
> a while ago i reimplemented spacing around display math and as a side effect there might be slightly different spacing (in which case probably the old situation was wrong
> 
> it relates to the fact that tex (traditionally) has some assumptions and does some spacing that interferes with the way we want to control spacing (e.g. it always forces baselineskips while we don't always want them) and it was close to impossible to identify such cases robustly
> 
> (think of preceding lines with different depths)
> 
> recent luatex has ways to disable that so i could finally come up with cleaner spacing models for display math
> 
> so, apart from bugs the current model is the one that will stay (or course more control can be added)
> 
> Hans
> 
> 
> -----------------------------------------------------------------
>                                          Hans Hagen | PRAGMA ADE
>              Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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