How to get longtable to make the rows flushbottom?

Question

I have a longtable where every row can have a slightly different height and is followed by a \hline. How can I get the rows of the pages to be \flushbottomend?

Here's a MWE:

\documentclass[a5paper]{article}
\usepackage{longtable}
\usepackage[showframe]{geometry}
\usepackage{lipsum}
\setlength{\parindent}{0pt}
\flushbottom
\begin{document}
\lipsum[1-4]\newpage
\begin{longtable}{@{}p{\linewidth}@{}}
\lipsum[1]\tabularnewline\hline
\lipsum[1]\tabularnewline\hline
\lipsum[1]\tabularnewline\hline
\lipsum[1]\tabularnewline\hline
\lipsum[1]\tabularnewline\hline
\end{longtable}
\end{document}

A pdf is here. Ideally every row should stretch, but I'd be satisfied if only the last one was stretched.

Answer 1

Basically you can't.

What you could do is insert some stretch space between rows (so long as you have no vertical rules) for example

\documentclass[a5paper]{article}
\usepackage{longtable}
\usepackage[showframe]{geometry}
\usepackage{lipsum}
\setlength{\parindent}{0pt}
\flushbottom
\begin{document}
\lipsum[1-4]\newpage
\begin{longtable}{@{}p{\linewidth}@{}}
\lipsum[1]\tabularnewline\hline\noalign{\vfill}
\lipsum[1]\tabularnewline\hline\noalign{\vfill}
\lipsum[1]\tabularnewline\hline\noalign{\vfill}
\lipsum[1]\tabularnewline\hline\noalign{\vfill}
\lipsum[1]\tabularnewline\hline\noalign{\vfill}
\end{longtable}
\end{document}

Pushes the rows down turning

into this:

But you can't affect the typesetting within the rows for the usual reasons that TeX page breaking happens in the output routine after the galley has been set so can't affect the boxes within the page.

Of course it is possible to do anything, but not necessarily possible with that package...