status = annot:SetTextAnnotOpened(open)
annot:SetTextAnnotOpened() defines whether the text-annotation is initially open.
Returns #HPDF_OK on success. Otherwise, returns an error code and the error handler is invoked.
True means the annotation initially displayed open#HPDF_INVALID_ANNOTATION - An invalid annotation handle was set.
#HPDF_FAILED_TO_ALLOC_MEM - Memory allocation failed.