Testing runlatex.minrunlines=3; to avoid adding interaction to very small fragment examples.
\textbf{some text}
\textbf{nl some text}
\textbf{nl some text nl}
\fbox{this}
\textbf{some text}
\fbox{this}
\textbf{nl some text}
\fbox{this}
\textbf{nl some text nl}
\textit{one}
\textbf{some text}
\textsf{three}
\textit{one}
\textbf{nl some text}
\textsf{three}
\textit{one}
\textbf{nl some text nl}
\textsf{three}