Hi,
There was already several questions about "user_defined" whatsits and I know
that sometimes
it can still influence the output (like there will be no font kern between two
letters if there is a whatsit).
I'm analyzing all available methods for marking output contents for tagged pdf
or xml conversions.
Now I noticed that it disables \last.. elements (like \lastskip, \lastpenalty)
in vertical mode. In
horizontal mode it doesn't influence \lastskip. So is it a bug? And could it be
fixed in the future
or this behavior will stay for ever?
minimal example
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\directlua{
USER_MARK = node.new("whatsit","user_defined")
USER_MARK.type = 115
USER_MARK.value = "my node"
function writemark()
local usermark = node.copy(USER_MARK)
node.write(usermark)
end
}
\def\addwhatsit{\directlua{writemark()}}
\documentclass{article}
\begin{document}
\null
\vskip 20pt
\par
\showthe\lastskip %% shows 20.0pt
\null
\vskip 30pt
\par
\addwhatsit
\showthe\lastskip %% shows 0.0pt
\null
\hskip 10pt
\addwhatsit
\showthe\lastskip %% shows 10.0pt
\end{document}
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