On Wed, 18 May 2011, Hans Hagen wrote:

On 18-5-2011 6:58, Aditya Mahajan wrote:
On Tue, 17 May 2011, Taco Hoekwater wrote:

Hi Hans/ Aditya,

With the latest beta, \startmatrix's final \NR creates a
superfluous line, resulting in ugly output:

Bugfix:

In \dodefinemathmatrix, change

\setuvalue{\e!stop #1}{\dostopmathmatrix}%

to

\setvalue{\e!stop #1}{\dostopmathmatrix}%

If someone wants to correct this in a working document, add

\let\stopmatrix\dostopmathmatrix

somewhere before \starttext

\starttext
\startformula
\startmatrix[left={\left(\,},right={\,\right)}]
\NC 0 \NR
\NC 0 \NR
\NC 0 \NR % removing this fixes the output
\stopmatrix
\stopformula
\stoptext

I don't know why \setuvalue gives an extra space. Hopefully, you or Hans
will be able to figure that out.

no clue yet but

\unexpanded\def\dostopmathmatrix

gives an extra row

Simpler example:

\def\A{\halign \bgroup ## \crcr}
\unexpanded\def\B{\crcr\egroup}
\def\C{\crcr\egroup}

\starttext
\ruledvbox{\A A \cr B \cr \B}

\ruledvbox{\A A \cr B \cr \C}
\stoptext

Same results with MkII and MkIV, so this is not a luatex issue.

Aditya
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