When wrapping, only break lines at whitespace

[slideclimb]

Fix #3491

Summary of additions and changes

• Only break lines at whitespace when wrapping.
• Somehow, wrapping behaviour while typing is still the same as before.

How to test this pull request

\documentclass{article}
\begin{document}
    Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore (aaaaa)
\end{document}

• Updated the documentation, or no update necessary
• Added tests, or no tests necessary