I'm struggling to understand what's happening here:
I am creating a table, and want the column on the far left to have text which is vertically centered in its cell. However, the vertical alignment seems to be completely inconsistent.
Here is my code (I had to include filler text or the issue was not properly demonstrated, sorry if it looks messy!). I've tried to provide a minimum working example.
\documentclass{article}
\usepackage{multirow}
\usepackage{array}
\usepackage{ragged2e}
\newcolumntype{P}[1]{>{\RaggedRight\hspace{0pt}}p{#1}}
\begin{document}
\begin{table}[htbp]
\caption{Sample Table.}\label{tab1}
\begin{tabular}{ |m{0.5cm}|P{4cm}|P{4.3cm}|P{4.5cm}| }
\hline
\textbf{} & \textbf{Objective} & \textbf{Criteria} & \textbf{Test Plan}\\
\hline
\multirow{7}{*}{\rotatebox{90}{Performance}} & Filler text to demonstrate problem, filler filler filler filler filler. & Filler text to demonstrate problem, filler filler filler filler filler. & Filler text to demonstrate problem, filler filler filler filler filler.\\ \cline{2-4}
&Filler text to demonstrate problem, filler filler filler filler filler. & Filler text to demonstrate problem, filler filler filler filler filler. & Filler text to demonstrate problem, filler filler filler filler filler. \\ \cline{2-4}
& & & \\ \cline{2-4}
& & & \\ \cline{2-4}
& & & \\ \cline{2-4}
& & & \\ \cline{2-4}
& & & \\ \hline
\multirow{2}{*}{\rotatebox{90}{Dimensions}} & Filler text to demonstrate problem, filler filler filler filler filler. & Filler text to demonstrate problem, filler filler filler filler filler. & Filler text to demonstrate problem, filler filler filler filler filler.\\ \cline{2-4}
& Filler text to demonstrate problem, filler filler filler filler filler. & Filler text to demonstrate problem, filler filler filler filler filler. & Filler text to demonstrate problem, filler filler filler filler filler.\\ \hline
\multirow{5}{*}{\rotatebox{90}{Safety}} & Filler text to demonstrate problem, filler filler filler filler filler. & Filler text to demonstrate problem, filler filler filler filler filler. & Filler text to demonstrate problem, filler filler filler filler filler.\\ \cline{2-4}
& & & \\ \cline{2-4}
& & & \\ \cline{2-4}
& & & \\ \cline{2-4}
& & & \\ \hline
\end{tabular}
\end{table}
\end{document}
This produces the following table, in which the left most cells are not properly vertically aligned. How could I fix this? Many thanks!