fixes timestep next issue (#2732)

lib/timeline/TimeStep.js

@@ -193,46 +193,26 @@ TimeStep.prototype.next = function() {
 
   // Two cases, needed to prevent issues with switching daylight savings
   // (end of March and end of October)
-  if (this.current.month() < 6)   {
-    switch (this.scale) {
-      case 'millisecond':  this.current.add(this.step, 'millisecond'); break;
-      case 'second':       this.current.add(this.step, 'second'); break;
-      case 'minute':       this.current.add(this.step, 'minute'); break;
-      case 'hour':
-        this.current.add(this.step, 'hour');
-        // in case of skipping an hour for daylight savings, adjust the hour again (else you get: 0h 5h 9h ... instead of 0h 4h 8h ...)
-          // TODO: is this still needed now we use the function of moment.js?
-        this.current.subtract(this.current.hours() % this.step, 'hour');
-        break;
-      case 'weekday':      // intentional fall through
-      case 'day':          this.current.add(this.step, 'day'); break;
-      case 'month':        this.current.add(this.step, 'month'); break;
-      case 'year':         this.current.add(this.step, 'year'); break;
-      default: break;
-    }
-  }
-  else {
-    switch (this.scale) {
-      case 'millisecond':  this.current.add(this.step, 'millisecond'); break;
-      case 'second':       this.current.add(this.step, 'second'); break;
-      case 'minute':       this.current.add(this.step, 'minute'); break;
-      case 'hour':
-        this.current.add(this.moment.duration(this.step, 'hour'));
+  switch (this.scale) {
+    case 'millisecond':  this.current.add(this.step, 'millisecond'); break;
+    case 'second':       this.current.add(this.step, 'second'); break;
+    case 'minute':       this.current.add(this.step, 'minute'); break;
+    case 'hour':
+      this.current.add(this.step, 'hour');
 
-        // correct for daylight saving
-        // FIXME: use this.current.add(moment.duration(this.step, 'hour'))
-        // see http://momentjs.com/docs/#special-considerations-for-months-and-years
+      if (this.current.month() < 6) {
+        this.current.subtract(this.current.hours() % this.step, 'hour');
+      } else {
         if (this.current.hours() % this.step !== 0) {
           this.current.add(this.step - this.current.hours() % this.step, 'hour');
         }
-
-        break;
-      case 'weekday':      // intentional fall through
-      case 'day':          this.current.add(this.step, 'day'); break;
-      case 'month':        this.current.add(this.step, 'month'); break;
-      case 'year':         this.current.add(this.step, 'year'); break;
-      default:             break;
-    }
+      }
+      break;
+    case 'weekday':      // intentional fall through
+    case 'day':          this.current.add(this.step, 'day'); break;
+    case 'month':        this.current.add(this.step, 'month'); break;
+    case 'year':         this.current.add(this.step, 'year'); break;
+    default: break;
   }
 
   if (this.step != 1) {