I want to exend the line in xltabular to cover as well the definitons of @{}. For this question I found a solution with the optional parameter (lr) which is more or less documented in the booktabs documentation under Booktabs and longtables. But somehow the fix doesn't work if the rule is followed by a line which spans over the whole table width.
\documentclass[a4paper,11pt]{article}
\usepackage[margin=2.5cm]{geometry}
\usepackage[shorthands=off, bidi=basic, english, ngerman]{babel}%
\usepackage[table]{xcolor}
\usepackage{booktabs}
\aboverulesep=0pt
\belowrulesep=0pt
\cmidrulekern=-\tabcolsep
\usepackage{xltabular} % for tables with long lines & long tables (over >1 page)
\usepackage{luacolor,lua-ul} %for usage of style attributes - background color
\begin{document}
\begin{xltabular}{\textwidth}{@{} X X X @{}}
\cmidrule[1pt](lr){1-3}
\rowcolor[HTML]{b96ad9}
\textbf{Firstname} &
\textbf{Lastname} &
\textbf{Age} \\
\bottomrule(lr)
\cellcolor[HTML]{b96ad9}Jill &
Smith &
50 \\
\midrule(lr)
Eve &
\cellcolor[HTML]{b96ad9}Jackson &
94 \\
\midrule(lr)
\end{xltabular}
\begin{xltabular}{\textwidth}{@{} X X @{}}
% \midrule(lr) %<-------------------------- failure: Misplaced \omit. \end{xltabular}
\multicolumn{2}{@{}>{\hsize=\dimexpr2\hsize+2\tabcolsep\relax} X @{}}{
span over multiple rows with long text to fill in to cover the distance} \\
column 1 & column2 \\
\end{xltabular}
\begin{xltabular}{\textwidth}{@{} X X X @{}}
% \midrule(lr) %<-------------------------- failure: Misplaced \noalign. \end{xltabular}
\rowcolor[HTML]{b96ad9}
\textbf{Firstname} &
\textbf{Lastname} &
\textbf{Age} \\
\end{xltabular}
\end{document}
Is there a way to fix both of the errors?
