Verbatim blocks should not span page boundaries when possible

[istathar]

Ideally verbatim environments would not have page breaks in them.

According to this answer on TeX StackExchange, the following has the desired effect:

\begin{Verbatim}[samepage=true]
Some looooong text...
\end{Verbatim}

casual testing shows this to be workable.

At present Pandoc is emitting \begin{verbatim} around fenced code blocks, so we would need to intercept these and instead insert \begin{Verbatim}[samepage=true].

Far better would be if this was simply a package level setting we could recommend and put in the default preamble.

[istathar]

Ah. Pandoc already expected (and in its default template included, which we then ported to the beginning function in LatexPreamble, which is then emitted as 99_Beginning.latex file in the temporary directory) a \DefineVerbatimEnvironment{Highlighting}{Verbatim}. We can use that to change the initial (aka default) option values for the custom verbatim environment.

[istathar]

So the line needs to have the samepage=true option added. But now I'm doubting the wisdom of this. This is typesetting; if someone wants a pagebreak in a different place they can use \clearpage. Hm.