add glue for tabu to work with longtable from bookworm/sid

teckids2style.sty

@@ -69,6 +69,61 @@
  \let\f@nch@setoffs\fancy@setoffs%
 \fi%
 
+% tabu vs. longtable compatibility glue
+\@ifpackagelater{longtable}{2020/01/08}{%
+ \PackageWarning{teckids2style}{%
+  longtable newer than v4.13, applying\MessageBreak LT gbox hack%
+ }%
+ %
+ % https://github.com/tabu-issues-for-future-maintainer/tabu/issues/26
+ %
+ \def\tabuendlongtrial{%
+    \LT@echunk  \global\setbox\LT@gbox \hbox{\unhbox\LT@gbox}\kern\wd\LT@gbox
+                \LT@get@widths
+ }%
+}{}%
+\@ifpackagelater{longtable}{2021/04/18}{}{%
+ \PackageWarning{teckids2style}{%
+  longtable older than v4.15, applying\MessageBreak underfull vbox hack%
+ }%
+ %
+ % bugfix for "Underfull \vbox (badness 10000) detected" of longtable / longtabu, see:
+ % https://tex.stackexchange.com/a/71121
+ %
+ \def\LT@start{%
+	\let\LT@start\endgraf
+	\endgraf\penalty\z@\vskip\LTpre
+	\dimen@\pagetotal
+	\advance\dimen@ \ht\ifvoid\LT@firsthead\LT@head\else\LT@firsthead\fi
+	\advance\dimen@ \dp\ifvoid\LT@firsthead\LT@head\else\LT@firsthead\fi
+	\advance\dimen@ \ht\LT@foot
+	\edef\restore@vbadness{\vbadness\the\vbadness\relax}% (added)
+	\vbadness=\@M% (added)
+	\dimen@ii\vfuzz
+	\vfuzz\maxdimen
+	\setbox\tw@\copy\z@
+	\setbox\tw@\vsplit\tw@ to \ht\@arstrutbox
+	\setbox\tw@\vbox{\unvbox\tw@}%
+	\vfuzz\dimen@ii
+	\restore@vbadness% (added)
+	\advance\dimen@ \ht
+	\ifdim\ht\@arstrutbox>\ht\tw@\@arstrutbox\else\tw@\fi
+	\advance\dimen@\dp
+	\ifdim\dp\@arstrutbox>\dp\tw@\@arstrutbox\else\tw@\fi
+	\advance\dimen@ -\pagegoal
+	\ifdim \dimen@>\z@\vfil\break\fi
+	\global\@colroom\@colht
+	\ifvoid\LT@foot\else
+	\advance\vsize-\ht\LT@foot
+	\global\advance\@colroom-\ht\LT@foot
+	\dimen@\pagegoal\advance\dimen@-\ht\LT@foot\pagegoal\dimen@
+	\maxdepth\z@
+	\fi
+	\ifvoid\LT@firsthead\copy\LT@head\else\box\LT@firsthead\fi\nobreak
+	\output{\LT@output}%
+ }%
+}%
+
 \definecolor{teckidsorangedark}{HTML}{FF6600}%
 \definecolor{teckidsorangelight}{HTML}{FF9955}%
 \definecolor{teckidsbluegradientlight}{HTML}{00CBFA}%