possible bugfix for subtree view stepinto

ui/src/main/java/edu/kit/iti/formal/psdbg/gui/controller/DebuggerMain.java

@@ -1462,10 +1462,17 @@ public class DebuggerMain implements Initializable {
             ptree.setDeactivateRefresh(false);
 
             if (stateAfterStmt.size() > 0) {
-                Set<Node> sentinels = proof.getSubtreeGoals(pnode)
+                proof.getSubtreeGoals(pnode).forEach(goal -> System.out.println("goal.node().serialNr() = " + goal.node().serialNr()));
+                Set<Node> sentinels;
+                sentinels = proof.getSubtreeGoals(pnode)
                         .stream()
                         .map(Goal::node)
                         .collect(Collectors.toSet());
+                if(sentinels.size() == 0){
+                    sentinels = new LinkedHashSet();
+                    sentinels.add(pnode);
+                    //sentinels.add(stateAfterStmt.get(0).getData().getNode());
+                }
                 ptree.getSentinels().addAll(sentinels);
                 sentinels.forEach(node -> ptree.setNodeColor(node, "blueviolet"));
             } else {
@@ -1481,7 +1488,6 @@ public class DebuggerMain implements Initializable {
                 //traverseProofTreeAndAddSentinelsToLeaves();
             }
 
-
             ptree.expandRootToSentinels();
             System.out.println("ptree = " + ptree.getRoot());
             DockNode node = new DockNode(ptree, "Proof Tree for Step Into: " +

ui/src/main/java/edu/kit/iti/formal/psdbg/gui/controls/ProofTree.java

@@ -159,13 +159,16 @@ public class ProofTree extends BorderPane {
         this.colorOfNodes.put(n, color);
     }
 
+
     public void expandRootToSentinels() {
         if (getTreeProof().getRoot() == null) {
             if (root.get() != null) {
-                TreeItem<TreeNode> item = treeCreation.populate("Proof", root.get());
-               // populate(root.get().serialNr() + ": " + root.get().serialNr(), root.get());
-                //val treeNode = new TreeNode("Proof", root.get());
-
+                TreeItem<TreeNode> item;
+                if(sentinels.contains(root.get())){
+                    item = treeCreation.itemFactory(root.get());
+                } else {
+                    item = treeCreation.populate("Proof", root.get());
+                }
                 treeProof.setRoot(item);
 
             }
@@ -438,6 +441,8 @@ public class ProofTree extends BorderPane {
                 node = node.child(0);
                 currentItem.getChildren().add(new TreeItem<>(new TreeNode(node.serialNr() + ": " + toString(node), node)));
             }
+
+
                 /*do {
                     currentItem.getChildren().add(itemFactory(node));
                     node = node.child(0);