feat: prepare VariationTreeNode for storing endif lines

Author: eugen-shulimov

src/main/java/org/variantsync/diffdetective/variation/tree/VariationTreeNode.java

@@ -82,6 +82,11 @@ public class VariationTreeNode<L extends Label> extends VariationNode<VariationT
      */
     private final List<VariationTreeNode<L>> childOrder;
 
+    /**
+     * The line with the endif of the corresponding if, if the node is an if node, otherwise null
+     */
+    private String endIf = null;
+
     /**
      * Creates a new node of a variation tree.
      *
@@ -226,6 +231,22 @@ public void removeAllChildren() {
         childOrder.clear();
     }
 
+    /**
+     * Returns the line with the endif of the corresponding if, if the node is an if node, otherwise null
+     * @return String, the Line with endif
+     */
+    public String getEndIf() {
+        return endIf;
+    }
+
+    /**
+     * Sets the line with the endif of the corresponding if, if the node is an if node
+     * @param endIf String, the Line with endif
+     */
+    public void setEndIf(String endIf) {
+        this.endIf = endIf;
+    }
+
     @Override
     public Node getFormula() {
         return featureMapping;