I would like to make a "row" of a \startalign ... \stopalign "hidden". The following fails.
\starttext \definelayer[hiddenlayer][state=stop] \startformula \startalign[n=3,align={right,middle,left}] \NC a \NC = \NC b \NR \setlayer[hiddenlayer]{\NC a + c \NC = \NC b + c \NR} \stopalign \stopformula \stoptext Troy Henderson
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