如何使用嵌套的 itemize 环境将表格中的第一个 \item 与基线对齐

Question

在 beamer 演示文稿中（否setspace，否enumitem），我想在表格的列内使用 itemize 环境。我希望第一行\item显示在与其他列的第一行相同的基线上。这个问题最初是问的这里，但由于出现了不同的问题，我把问题拆分了。这问题我已经弄清楚了它如何与修改的 一起工作。但是，如果表格本身放在环境中，linespread我无法设法正确对齐第一个。这里正确的移位距离是多少？请注意，当嵌套级别增加时，所需的距离似乎会略有变化！\itemitemize

\documentclass{beamer}
\usepackage{tikz}

\newcommand{\tikzmark}[2]{
\tikz[baseline=(#1.base), remember picture]{
\node(#1)[inner sep=0pt]{#2};
}
}   

\begin{document}
\setlength{\tabcolsep}{0pt}
\begin{frame}{title}
    \begin{itemize}%
    \item level 1, 1
    \item 
    \begin{tabular}[t]{lp{0.8\linewidth}}
    \tikzmark{left}{level 1, 2} & \vspace*{-1\baselineskip}
    \begin{itemize}
        \item \tikzmark{right}{level 2,1} \\ (with possibly two lines) 
        \item 
            \begin{tabular}[t]{lp{0.8\linewidth}}
                \tikzmark{left2}{level 2, 2} & \vspace*{-1\baselineskip}
                \begin{itemize}
                    \item \tikzmark{right2}{level 3,1} \\ (with possibly two lines) 
                    \item level 3, 2
                \end{itemize}
            \end{tabular}
    \end{itemize}
    \end{tabular}
    \end{itemize}
        \tikz[overlay, remember picture]{
        \draw[red, line width=0.05pt](left.south west)--(right.south east|-left.south west);
        }
        \tikz[overlay, remember picture]{
        \draw[red, line width=0.05pt](left2.south west)--(right2.south east|-left2.south west);
        }
    \end{frame}
\end{document}

Answer 1

1pt 是 interlineskip，与\rlapparbox 一起没有实际宽度

\documentclass{beamer}
\begin{document}
\begin{frame}{title}
        \begin{itemize}%
            \item level 1, 1
            \item level 1, 2 
            \rlap{\parbox[t]{\linewidth}{\vspace*{\dimexpr-\baselineskip+1pt}
            \begin{itemize}
                    \item level 2, 1 \newline (with possibly two lines) 
                    \item level 2, 2
                     \rlap{\parbox[t]{\linewidth}{\vspace*{\dimexpr-\baselineskip+1pt}
                    \begin{itemize}
                        \item level 3, 1 \newline (with possibly two lines) 
                        \item level 3, 2
                    \end{itemize}}}% inner parbox
            \end{itemize}}}% outer parbox
        \end{itemize}
\end{frame}
\end{document}