[Core] fix: only delegate the delegate part of a composed dsl container

openmole/core/org.openmole.core.workflow/src/main/scala/org/openmole/core/workflow/composition/package.scala

@@ -214,6 +214,12 @@ package composition {
       case TaskNodeDSL(n)     ⇒ Vector(n)
     }
 
+    def delegate(t: DSL) =
+      t match {
+        case c: DSLContainer[_] ⇒ c.delegate
+        case t                  ⇒ tasks(t).map(_.task)
+      }
+
   }
 
   /* -------------------- Transition DSL ---------------------- */

openmole/plugins/org.openmole.plugin.tool.pattern/src/main/scala/org/openmole/plugin/tool/pattern/package.scala

@@ -31,7 +31,7 @@ package object pattern {
       val firstEvaluation = EmptyTask() set ((inputs, outputs) += (inputVals: _*))
       val lastEvaluation = EmptyTask() set ((inputs, outputs) += (outputVals: _*))
       val puzzle = Strain(firstEvaluation) -- Capsule(evaluation) -- lastEvaluation
-      DSLContainer(puzzle, delegate = DSL.tasks(evaluation).map(_.task))
+      DSLContainer(puzzle, delegate = DSL.delegate(evaluation))
     }
 
 }