[texhax] List of Examples

Uwe Lueck uwe.lueck at web.de
Fri Sep 25 12:40:07 CEST 2015

On Freitag, 25. September 2015 um 00:42 Uhr, DPC a écrit :
UL  >> it seems to be very difficult to avoid a page break after a header paragraph,

DPC > Just call the latex macro \@afterheading which will handle suppressing page breaks

\@afterheading in latex.ltx, \@xsect, /follows/ the \vskips that frightened me.
However, I see there and with \showlists, that \par\nobreak protects next \vskips,
it /precedes/ next \parskip. TeXbook p. 262: "Then comes `\noindent', which
causes TeX to go into horizontal mode and to emit \parskip glue."
@Bob: \vskip in horizontal mode (with no \vadjust{\nobreak}) creates a 
possible breakpoint.

Through this thread, I have realized that a low-level heading construction 
of my own in an ongoing project allowed a page break immediatly after.



\ProvidesFile{sechdbrk.tex}[2015/09/25 dem. pbrk. after sechd.]
  \tracingonline=1 \showboxdepth=0 \showboxbreadth=10
 {\large A        %% attempt to format heading at low level
% \par            %% uncomment to get vertical \penalty 10000
  \vskip3.333pt } %% ensures vmode without earlier \par,
                  %% including \large \baselineskip
  \makeatletter \@afterheading B \par \showlists

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