Pass : Fixed selfShaders cloning

Author: TothBenoit

h3d/mat/Pass.hx

@@ -377,7 +377,17 @@ class Pass {
 
 	public function clone() {
 		var p = new Pass(name, shaders.clone());
-		p.selfShaders = selfShaders;
+		if ( selfShaders != null ) {
+			var sl = selfShaders;
+			var prev = null;
+			while ( sl != null && sl != shaders)  {
+				prev = sl;
+				sl = sl.next;
+			}
+			prev.next = null;
+			p.selfShaders = selfShaders.clone();
+			prev.next = sl;
+		}
 		p.bits = bits;
 		p.enableLights = enableLights;
 		if (stencil != null) p.stencil = stencil.clone();