On 4/1/2016 9:59 PM, Jan Tosovsky wrote:
On 2016-04-01 Hans Hagen wrote:
On 3/31/2016 10:47 PM, Wolfgang Schuster wrote:
On 2016-03-31 Jan Tosovsky wrote:

I couldn't find any details for that \leftboundary

spac-ver.mkiv:

\unexpanded\def\leftboundary   {\boundary\plusone}
\unexpanded\def\rightboundary  {\boundary\plustwo}

it will instruct the protrusion checker to skip the next or
previous node (e.g. a char or hbox or ...) when looking for
an edge

Thanks for details. So if that worked with plain \hbox should be taken rather 
as coincidence?

a hbox becomes one node so that one node is ignored

I prefer motto the fewer commands, the better :-)

Jan


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