Fix preset option packing

SpritePacker/SpritePacker.cs

@@ -7,6 +7,7 @@ using System.Configuration;
 using System.Drawing.Text;
 using System.Drawing.Imaging;
 using System.Text;
+using System.Linq;
 
 namespace SpritePacker
 {
@@ -80,14 +81,10 @@ namespace SpritePacker
 		{
 			sortBySize();
 
-			List<Sprite> arrangedSprites = new List<Sprite>();
-			foreach(Sprite cspr in sprites)
+			List<Sprite> arrangedSprites = sprites.Where((Sprite spr) => spr.Placed).ToList();
+			List<Sprite> spritesToPack = sprites.Where((Sprite spr) => !spr.Placed).ToList();
+			foreach(Sprite cspr in spritesToPack)
 			{
-				if (cspr.Placed) {
-					if(Verbose) Console.WriteLine($"Skipping placement of {cspr} as it has been preset");
-					continue;
-				}
-
 				if(Verbose) Console.WriteLine("Attempting to place {0}.", cspr);
 				Point scanLines = Point.Empty;
 				Point nextScanLines = new Point(int.MaxValue, int.MaxValue);