Prevent graph from restarting when setting duplicate data

Author: philackm

Classes/ScrollableGraphView.swift

@@ -443,6 +443,12 @@ import UIKit
     // ######################
 
     public func setData(data: [Double], withLabels labels: [String]) {
+        
+        // If we are setting exactly the same data and labels, there's no need to re-init everything.
+        guard self.data != data && self.labels != labels else {
+            return
+        }
+        
         self.dataNeedsReloading = true
         self.data = data
         self.labels = labels