[Tex/LaTex] height of diagbox with tabularx and multirow

diagboxtables

How can get the diagbox on the whole width of the connected rows? Problem now, its height seems to be only 2 textlines. Here is my MWE:

\documentclass[a4paper,10pt]{article}
\usepackage{multirow,diagbox,tabularx,blindtext}
\begin{document}
\begin{tabularx}{\textwidth}{|c|X|X|}
\hline
\multirow{2}{*}{\diagbox{Spalte}{Zeile}} & Text & Text\\
 & sehr sehr sehr sehr langer Text mit mehreren Zeilenumbrüchen & Text\\
Text & Text & Text\\
\hline
\end{tabularx}
\end{document}

Best Answer

Like this? I've added some \arraystretch:

\documentclass[a4paper,10pt, pdftex]{article}
\usepackage{multirow,diagbox,tabularx,blindtext}

\begin{document}

\renewcommand\arraystretch{1.5}
\begin{tabularx}{\textwidth}{|c|X|X|}
  \hline
  \multirow{2}{*}{\diagbox[height=5\line]{\raisebox{2ex}{Spalte}}{ & & \\Zeile}} & Text & Text\\
 & sehr sehr sehr sehr langer Text mit mehreren Zeilenumbrüchen & Text \\
  \cline{1-1}
  Text & Text & Text \\
  \hline
\end{tabularx}

\end{document} 

enter image description here