pandoc doesn’t text-wrap code blocks when converting to pdf

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If you have a recent installation of LaTeX that includes the fvextra package, then there is a simple solution, recently suggested by jannick0.

Modify your YAML header options to include

\usepackage{fvextra}
\begin{Highlighting}[breaklines,numbers=left]

and compile with xelatex.

For instance,

---
header-includes:
 - \usepackage{fvextra}
 - \DefineVerbatimEnvironment{Highlighting}{Verbatim}{breaklines,commandchars=\\\{\}}
---

~~~~~{.java}
this is a very long long long long long long long long long long long long long line which is broken
~~~~~~

when compiled with 

pandoc input.md --pdf-engine=xelatex -o output.pdf

gives enter image description here

If you had the .numberLines option, i.e., 

---
header-includes:
 - \usepackage{fvextra}
 - \DefineVerbatimEnvironment{Highlighting}{Verbatim}{breaklines,commandchars=\\\{\}}
---


~~~~~{.java .numberLines}
this is a very long long long long long long long long long long long long long line which is broken
~~~~~~

then the same command would produce

enter image description here

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