ANALYSIS — Republicans and Democrats are locked in a redistricting battle for the ages, and there’s bipartisan complaining about different parts of the process. But the two parties are a long way from a truce, and redistricting is looking more like a biennial exercise than a once-a-decade event. Amid the day-to-day tracking of the redistricting state of play, it’s important to remember that this cycle’s surge in cartography was caused by the Wh…