SplineWidget : Use additive compositing for drawing splines
SplineWidget : Use additive compositing for drawing splines

This means that color splines appear white for greyscale splines, rather than confusingly showing only a blue line.

ivanimanishi/gaffer,andrewkaufman/gaffer,appleseedhq/gaffer,ImageEngine/gaffer,hradec/gaffer,andrewkaufman/gaffer,boberfly/gaffer,lucienfostier/gaffer,appleseedhq/gaffer,andrewkaufman/gaffer,GafferHQ/gaffer,andrewkaufman/gaffer,johnhaddon/gaffer,boberfly/gaffer,GafferHQ/gaffer,lucienfostier/gaffer,lucienfostier/gaffer,hradec/gaffer,johnhaddon/gaffer,hradec/gaffer,ivanimanishi/gaffer,ImageEngine/gaffer,GafferHQ/gaffer,GafferHQ/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,hradec/gaffer,johnhaddon/gaffer,ivanimanishi/gaffer,lucienfostier/gaffer,boberfly/gaffer,ivanimanishi/gaffer,andrewkaufman/gaffer,boberfly/gaffer,appleseedhq/gaffer,ImageEngine/gaffer,ImageEngine/gaffer,johnhaddon/gaffer,hradec/gaffer,appleseedhq/gaffer