"Nation"? For me I suppose that would mean means a sizeable community of people who see themselves as having enough in common, and enough distinction from others, to justify themselves in requiring political independence if they wish it. It doesn't imply that they necessarily wish to exercise that right in full or even in part (ie home rule or local autonomy).

And on that definition it seems pretty evident that there is a nation in Quebec, just as there is in Scotland and in Wales.

The situation of Quebec in relation to Canada and Scotland in relation to the United Kingdom does seem very analogous to me. The existence of the European Union, which would mean that an independent Scotland would continue to have a close relationship with England and Wales, as is now the case with the Irish Republic, is a relevant factor in any future constitutional change.

If I was Quebecois I would want to ensure that bwhatever happens there will be some some equivalent amicable relationship with the rest of Canada. And the same would apply if I was any kind of Canadian.