TikZ 对象动态大小，以适应表格内部

Question

我的文档上有一个 TikZ 定义的注释框：

\newenvironment{mynotefortab}[1]
  {\par\medskip\noindent
  \begin{tikzpicture}
    \node[inner sep=0pt] (box) {\parbox[t]{.99\textwidth}{%
      \begin{minipage}{.1\textwidth}
      \centering\tikz[scale=2]\node[scale=1]{\bcinfo};
      \end{minipage}%
      \begin{minipage}{.3\textwidth}
      \textbf{#1}
      \par\smallskip
      \BODY 
      \end{minipage}\hfill}%
    };
    \draw[blue!75!black,line width=1pt] 
      ( $ (box.north east) + (-2pt,1pt) $ ) -- ( $ (box.north east) + (0,1pt) $ ) -- ( $ (box.south east) + (0,-1pt) $ ) -- + (1pt,0);
    \draw[blue!75!black,line width=1pt] 
      ( $ (box.north west) + (2pt,1pt) $ ) -- ( $ (box.north west) + (0,1pt) $ ) -- ( $ (box.south west) + (0,-1pt) $ ) -- + (2pt,0);
  \end{tikzpicture}\par\medskip%
}

当我在任何其他元素之外调用它时，它工作得很好。但我希望它也适合在文档开头定义的表格结构中：

\newcommand{\mystarttable}{\renewcommand{\arraystretch}{2}\begin{tabular}{| >{\centering\arraybackslash}m{3.4cm}| m{10cm}|}\hline}
\newcommand{\mystoptable}{\end{tabular}}
\newcommand{\myrow}[2]{ #1&#2 \\ \hline }
\newcommand{\myitem}[1]{\item #1}

因此，当我调用如下命令时：

    \mystarttable
        \myrow{\textbf{mywhat}}{\mynotefortab{mynote}}
    \mystoptable

我希望注释框能够适合表格结构，而不会在编译时引发任何错误或警告，现在没有绘制正确的线并且引发错误：

Underfull \hbox (badness 6461) in paragraph at lines 513--513
[] \T1/DejaVuSansCondensed-TLF/b/n/10 CC er-rors could be
! Undefined control sequence.
<argument> ...duplicated. } \par \smallskip \BODY 
                                                  \end {minipage}\hfill \@@par 
l.513 }

为了完整起见，我在我的文档中导入了以下库：

\documentclass[twoside,a4paper]{report}
\usepackage{fancyhdr, graphicx}
\usepackage{makeidx}
\usepackage{ifthen}
\usepackage{framed}
%\usepackage{xcolor}
\usepackage[usenames, dvipsnames]{xcolor}
\usepackage{environ}
\usepackage[tikz]{bclogo}
\usepackage{tikz}
\usetikzlibrary{calc}
\usepackage{lipsum}
\usepackage{titlesec}
\usepackage{tabularx}
\usepackage{caption}
\usepackage{DejaVuSansCondensed}
\usepackage{geometry}
\usepackage{titlesec}
\usepackage{tikz}
\usepackage{lipsum}
\usepackage{etoolbox}
\usepackage[utf8]{inputenc}