Redefine \\ for multiline cells in tabularray

Question

When using multiline cells with tabularray like in the example below, I have the problem that my editor (emacs) recognizes the \\ that indicate a newline in a cell as the end of a row and thus messes up aligning the table in the editor. So is there a way to use another command instead of \\ for the multiline cells or map it to another macro. I tried \newcommand{\nl}{\\}, but this doesn' work (it stretches the table to the right).

\documentclass{article}
\usepackage{tabularray}
\begin{document}
\begin{tblr}{colspec={clr},hlines}
    one & {left\\leftttt} & three          \\
    one & two             & {right\\rightttt} \\
\end{tblr}
\end{document}

(Example from here).

Answer 1

You can use your \nl command to break multiline cells by using varwidth library of tabularray package (and you don't need to enclose them with curly braces):

\documentclass{article}
\usepackage{tabularray}
\UseTblrLibrary{varwidth}
\SetTblrInner[tblr]{measure=vbox}
\newcommand{\nl}{\\}
\begin{document}
\begin{tblr}{colspec={clr},hlines}
  one                 & left\nl leftttt & three             \
  center\nl centerrrr & two             & right\nl rightttt \
\end{tblr}
\bigskip
\begin{tblr}{colspec={clr},hlines}
  one                 & {left\leftttt} & three             \
  {center\centerrrr} & two             & {right\rightttt} \
\end{tblr}
\end{document}