Overfull \vbox caused by tall text in multirow

Question

This is my first post here. I am struggling with overcoming problem of overfull \vbox warning. It is caused by three-lined cell of a table while it \multirow's only two one-lined. In fact in my main document using \\[0.5cm] works pretty well, but still produces the warning.

In MWE it also has nasty in-table margins.

I would appreciate any help from you. Thank you!

\documentclass[a4paper,12pt]{report}
\usepackage{tabularx}
\usepackage{multirow}
\begin{document}
\begin{table}[ht]
    \footnotesize
        \begin{tabularx}{\textwidth}{c | m{1.9cm} | X X | X X | X X | m{1.7cm} }
        blabla & blabla & \multicolumn{2}{c|}{blabla} & \multicolumn{2}{c|}{blabla} & \multicolumn{2}{c|}{blabla} & blabla \\ \hline
        & & \multicolumn{6}{ c| }{Name} & \multirow{2}{1.7cm}{Some pretty long text} \\ \cline{3-8}
        & & 1 & 2 & 3 & 4 & 5 & 6  & \\ \hline
        \end{tabularx}
\end{table}
\end{document}

Answer 1

Expanding on @GonzaloMedina's comment, since the column width is fixed and three lines of text are available (conceptually), a way to make the text fit into the three rows is to insert vertical rules which expand the second and third row. This won't get rid of the overfull boxes, but they will make the table look ok.

I propose two solutions. One without all of the vertical lines stuff and with fancy rules via booktabs

\documentclass[a4paper,12pt]{report}
\usepackage{tabularx, booktabs}
\usepackage{multirow}
\begin{document}
\begin{table}
    \footnotesize
        \begin{tabularx}{\textwidth}{@{}c m{1.9cm} *{6}{X}   m{1.7cm}@{} }
        \toprule
        blabla & blabla & \multicolumn{2}{c}{blabla} & \multicolumn{2}{c}{blabla} & \multicolumn{2}{c}{blabla} & blabla \\ \midrule
      \rule[1.5ex]{0pt}{2.5ex}  &\rule[1.5ex]{0pt}{2.5ex} & \multicolumn{6}{ c}{Name} & \multirow{2}{1.7cm}{Some pretty long text} \\ 
        & \rule[1.5ex]{0pt}{2.5ex}& 1 & 2 & 3 & 4 & 5 & 6  & \\ \bottomrule
        \end{tabularx}
\end{table}
\end{document}

The second adds the rules to the original table, but looks uglier to me (since vertical separator do not help readability and too many horizontal rules make the table bulkier)

\documentclass[a4paper,12pt]{report}
\usepackage{tabularx}
\usepackage{multirow}
\begin{document}
\begin{table}[ht]
    \footnotesize
        \begin{tabularx}{\textwidth}{c | m{1.9cm} | X X | X X | X X | m{1.7cm} }
        blabla & blabla & \multicolumn{2}{c|}{blabla} & \multicolumn{2}{c|}{blabla} & \multicolumn{2}{c|}{blabla} & blabla \\ \hline
        &\rule[1.5ex]{0pt}{2.5ex} & \multicolumn{6}{ c| }{Name} & \multirow{2}{1.7cm}{Some pretty long text} \\ \cline{3-8}
        &\rule[1.5ex]{0pt}{2.5ex} & 1 & 2 & 3 & 4 & 5 & 6  & \\ \hline
        \end{tabularx}
\end{table}
\end{document}