[as3] Fixed AnimationState not respecting MixBlend.first for rotate timelines. See #1274.

spine-as3/spine-as3/src/spine/animation/AnimationState.as

@@ -300,12 +300,19 @@ package spine.animation {
 			var rotateTimeline : RotateTimeline = RotateTimeline(timeline);
 			var frames : Vector.<Number> = rotateTimeline.frames;
 			var bone : Bone = skeleton.bones[rotateTimeline.boneIndex];
+			var r1 : Number, r2 : Number;
 			if (time < frames[0]) {
-				if (blend == MixBlend.setup) bone.rotation = bone.data.rotation;
+				switch (blend) {
+					case MixBlend.setup:
+						bone.rotation = bone.data.rotation;
+					default:
 						return;
+					case MixBlend.first:
+						r1 = bone.rotation;
+						r2 = bone.data.rotation;
 				}				
-
-			var r2 : Number;
+			} else {			
+				r1 = blend == MixBlend.setup ? bone.data.rotation : bone.rotation;
 				if (time >= frames[frames.length - RotateTimeline.ENTRIES]) // Time is after last frame.
 					r2 = bone.data.rotation + frames[frames.length + RotateTimeline.PREV_ROTATION];
 				else {
@@ -320,9 +327,9 @@ package spine.animation {
 					r2 = prevRotation + r2 * percent + bone.data.rotation;
 					r2 -= (16384 - int((16384.499999999996 - r2 / 360))) * 360;
 				}
+			}
 
 			// Mix between rotations using the direction of the shortest route on the first frame while detecting crosses.			
-			var r1 : Number = blend == MixBlend.setup ? bone.data.rotation : bone.rotation;
 			var total : Number, diff : Number = r2 - r1;
 			diff -= (16384 - int((16384.499999999996 - diff / 360))) * 360;
 			if (diff == 0) {