The many ways in which writer-director Andrew Haigh and fiction author Colm Tóibín share a kinship of sensibilities, notably in their impeccable gifts for intimate character observation, breathe warming embers into the sub-zero elemental severity of A Long Winter. A coming-of-age drama that touches delicately on grief and resilience, family and home, queer sexuality and liberating self-discovery, the film’s muted tone will be considered under-powered by some. But audiences willing to tune in to its slow-burn introspection and immersive sense of place will find a humanity that is its own reward, particularly in the probing performances of…