=\fieldcategoryparameter\c!start\relax
\definefieldbody[\currentfieldstackname][\c!type=check,\c!values={#symbol,\empty},\c!default={#symbol}]%
\else
\definefieldbody[\currentfieldstackname][\c!type=check,\c!values={#symbol,\empty},\c!default=]%
\fi
\setbox\scrn_fieldstack_box\hbox{\symbol[#symbol
that its ConTeXt's fault, as It has a Widget annotation without
the mandatory Rect field.
Is it really so? I couldn't find any threads on this on the list.
\nopdfcompression
\setupinteraction[state=start]
\definefieldbody[email][type=line]
\starttext
\startTEXpage
\fieldbody[email
\definefieldbody[email][type=line]
\fieldbody[email]
\stoptext
%%%
widget.pdf
Description: widget.pdf
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