[NTG-context] space in \inmargin

Hi all, there is probably somewhere a space in some macro called inside \inmargin. See example: \starttext \setbox0\hbox{\inmargin{XX}} \showbox0 A\box0 B \stoptext and a part of log with \showbox0: \hbox(10.41603+4.05064)x3.91663 .\glue 3.91663 plus 1.95831 minus 1.30554 .\hbox(10.41603+4.05064)x0.0 ... The first glue inside hbox seems to be product of \inmargin. Does somebody know where the space is? I did not dig into sources yet, have a nice day and thanks, Martin