Hello again Patrick,
The reason I've taken so long to reply, is that I've been trying to
understand TeX's line-breaking mechanism. Your perceptive question:
> Why is there a difference between knuth.tex and tufte.tex in the
> example (try \input tufte instead of \input knuth).
In the example below
%-- tryISOLayout.ctx ----------------------------------------
%output=pdf
\setuppapersize[A4][A4]
\setupencoding[default=texnansi]
\setupbodyfont[cmr,14.4pt]
\def\GoldenRatio{1.61803}
\setbox0\hbox{\dorecurse{26}{\character\recurselevel}}
\setuplayout[width=2.5\wd0,
header=\lineheight,
footer=\lineheight,
height=\GoldenRatio\makeupwidth,
headerdistance=\dimexpr(
(\makeupheight-37\lineheight-\headerheight-\footerheight) /2),
footerdistance=\headerdistance,
backspace=\dimexpr(\makeupwidth/7),
topspace=\dimexpr(\makeupwidth/7)]
\showframe
\starttext
\startlinenumbering
\dorecurse{5}{\input tufte}
\stoplinenumbering
\stoptext
%-- end tryISOLayout.ctx ------------------------------------
I think is due to TeX trying very hard not to generate a widow line.
Even after fiddling around with \looseness, I couldn't force TeX to
add the 37th line. I've a feeling that if you come across a
pathological case like the above, you really have to follow Knuth's
advice and rewrite the paragraph.
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