Please make TemplateHTMLRenderer interoperable with JSONRenderer

[mymedia2]

Hi there!

It looks that TemplateHTMLRenderer considers response.data as a context for the template. This behaviour however is not convenient in view sets if both JSONPRenderer and TemplateHTMLRenderer are encountered on the same renderer_classes list.

class OrderViewSet(viewsets.ModelViewSet):
    queryset = Order.objects.all()
    serializer_class = OrderSerializer
    renderer_classes = [JSONRenderer, TemplateHTMLRenderer]
    template_name = 'order_page.html'

Though, the list view does not work out-of-box because of #5236. And in the detail view, I can't grab single object as a whole in 'order_page.html' (for example to json_script).

I propose to revise the TemplateHTMLRenderer.get_template_context() method in some way and provide the 'data' key from there. The current view and some more environment info would also be handy, I suppose.