[NTG-context] Metapost+mpgraph withcolor

glabel <option list> withcolor is broken (mkiv and mkii). The label at the first point is black (the 2nd comes out red). %% minimal example %% \setupcolors[state=start] \usemodule[graph] \startuseMPgraphic{test} draw begingraph(16cm,12cm); gdraw (0,0) -- (1,1) withcolor red ; glabel.urt(btex beginning etex, 0) withcolor red ; glabel.llft(btex \red end etex, infinity) ; endgraph; \stopuseMPgraphic \starttext \startTEXpage \useMPgraphic{test} \stopTEXpage \stoptext