Good code style introduces whitespace in LaTeX

Question

Suppose I have the following in a test1.tex file:

\documentclass{article}
\begin{document}
  \section{A section with a very long title which goes beyond seventy-two columns in text editor}
\end{document}

Now suppose, for the sake of clean code, I would like to break up the long section title and corresponding brackets into separate lines with a max width of 72 columns as shown in test2.tex:

\documentclass{article}
\begin{document}
  \section{
    A section with a very long title which goes beyond seventy-two 
    columns in text editor
  }
\end{document}

The resulting pdf from latexmk -pdflatex test1.tex is different than the resulting pdf from latexmk -pdflatex test2.tex. test2.tex contains additional whitespace.

I understand why this occurs, but then how can I enforce good code style without causing extraneous whitespace like this?