Method onAction

src/app/PortWidget.cpp:108–117

	CableWidget* cw;

	void onAction(const ActionEvent& e) override {
		// history::CableColorChange
		history::CableColorChange* h = new history::CableColorChange;
		h->setCable(cw);
		h->newColor = color;
		h->oldColor = cw->color;
		APP->history->push(h);

		cw->color = color;
	}
};