Increase margin in section titles with titlesec

Question

I use the titlesec package to define section titles and use the format

\titleformat{\section}[display]
{\raggedright\LARGE}{\thesection}{1ex}{}

The font is quite large, so I would prefer to have a wider margin on the right so that I don't get

This is a long section title

but rather

This is a long

section title

How can I achieve that for all section titles? My question may be similar to this, but parbox seem to be intended for a centered box and it also does not provide a general formatting: Set margins / make box for the section title with titlesec

Answer 1

The last argument of \titleformat can contain code whose last macro takes the section title as argument. You can exploit this e.g. to put everything in a \parbox of given width.

\documentclass{article}

\usepackage{titlesec}
\titleformat{\section}[display]%
   {\raggedright\LARGE}%
   {\thesection}% 
   {1ex}% vertical space after label
   {\sectionformat}% before code
   [\vspace{1ex}]% after code (add some mor vertical space)
\newcommand*{\sectionformat}[1]{\parbox{5cm}{\raggedright#1}}

\begin{document}

\section{This is a long section title}
Bla bla bla

\end{document}