Is it real heartbreak if you can see it coming from miles away? This was a question I couldn’t quite get out of my mind throughout the near 2 hour running time of Onward, Pixar’s newest film. Real heartbreak, at least in my experience, seems to require an element of surprise, some emotional tragedy that springs up at you from nowhere. Whether fiction or reality, foreknowledge always seems to ease the pain. And in Onward, from nearly the first frame (or at least from the moment the whole shape of the plot comes clear) you can almost hear the clock ticking down to the anguish the movie intends to inflict…