Mix : Fix wrong behaviour outside of mask data window
Mix : Fix wrong behaviour outside of mask data window

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