[NTG-context] right and left arrowfill

[Hans van der Meer via ntg-context <ntg-context@ntg.nl>]

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A few days ago I drew attention to the fact that \rightarrowfill and \leftarrowfill are broken in the latest ConTeXt. Imho that should not happen with basic TeX macro's.
Although one can recreate their definitions from the TeX-book (see the MWE attached), I still do not understand why it should be needed.

yours sincerely
dr. Hans van der Meer

 

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\setupbodyfont[lmodern,10pt]
\starttext
Test \type{\rightarrowfill} and \type{\leftarrowfill}
\blank
\ConTeXt\ \contextversion
\blank
dotfill [\hbox to\textwidth{\dotfill}]
\blank
dotfill [\hbox to5cm{\dotfill}]
\blank
rightarrowfill [\hbox to5cm{\rightarrowfill}]
\blank
leftarrowfill [\hbox to5cm{\leftarrowfill}]
\blank
\blank
hrulefill [\hbox to5cm{\hrulefill}]
\blank
rightarrowfill = \meaning\rightarrowfill
\blank
leftarrowfill = \meaning\leftarrowfill
\blank
Redefine tex{rightarrowfill} from the \TeX-book p.357
\crlf
\def\rightarrowfill{$\mathsurround=\zeropoint \mathord- \mkern-6mu
	\cleaders\hbox{$\mkern-2mu \mathord- \mkern-2mu$}\hfill
	\mkern-6mu \mathord\rightarrow$}
rightarrowfill [\hbox to5cm{\rightarrowfill}]
\blank
Redefine tex{leftarrowfill} from the \TeX-book p.357
\def\leftarrowfill{$\mathsurround=\zeropoint \mathord\leftarrow \mkern-6mu
	\cleaders\hbox{$\mkern-2mu \mathord- \mkern-2mu$}\hfill
	\mkern-6mu \mathord-$}
\crlf
leftarrowfill [\hbox to5cm{\leftarrowfill}]
\blank
\stoptext

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