Merge pull request #3665 from pchote/frozen-fog-prereqs

Rework bibs (again).

OpenRA.Mods.RA/Effects/InvulnEffect.cs

@@ -38,6 +38,7 @@ namespace OpenRA.Mods.RA.Effects
 				yield break;
 
 			foreach (var r in a.Render(wr))
+				if (!r.IsDecoration)
 				yield return r.WithPalette(wr.Palette("invuln"));
 		}
 	}

OpenRA.Mods.RA/Effects/Parachute.cs

@@ -72,7 +72,9 @@ namespace OpenRA.Mods.RA.Effects
 			var shadow = wr.Palette("shadow");
 			foreach (var c in rc)
 			{
-				yield return c.WithPalette(shadow).WithZOffset(-1);
+				if (!c.IsDecoration)
+					yield return c.WithPalette(shadow).WithZOffset(c.ZOffset - 1).AsDecoration();
+
 				yield return c.OffsetBy(pos - c.Pos);
 			}