Examples

Commands \setbox...= box{...} might produce extra spaces because of the \par\leavevmode, an undesirable phenomena for framed pictures. Since boxes are in any case a problem for us for standard text, we are probably better-off deal properly at least with pictures.

<..html latex env ..>
<.initial env configurations .>
-_-_-

The above had ‘}{\csname after:listend\endcsname’ earlier.

The following are needed for cases like

\newenvironment{syntax}{\begin{center}
                        \begin{tabular}{|p{0.9\linewidth}|} \hline}%
                       {\hline
                        \end{tabular}
                        \end{center}}
\begin{syntax} aa \\  \end{syntax}

<..ignore par before hline in end ..>
\ifx \EndPicture\:UnDef
    \def\:temp{<.end row before hline .>%
       \expandafter\expandafter\expandafter\:temp}%
    \expandafter\:temp
\fi
-_-_-

<..end row before hline ..>
\def\:temp{%
    \def\:temp{\IgnorePar
      \ifx \:tempa\hline \expandafter\\\else\fi
    }%
    \futurelet\:tempa\:temp
}%
-_-_-

[test data]

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