Use static_cast instead of qOverload because it is only supported in qt5.7+
Use static_cast instead of qOverload because it is only supported in
qt5.7+

chigraph/chigraph,GuapoTaco/chigraph,chigraph/chigraph,chigraph/chigraph,russelltg/chigraph,GuapoTaco/chigraph,russelltg/chigraph