improved the caching in the contour window drawing so it does allocation on each redraw
improved the caching in the contour window drawing so it does allocation on each redraw

svn: r10964

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket