When we redirect, add initial node to the context

src/main/java/com/mojang/brigadier/CommandDispatcher.java

@@ -109,7 +109,7 @@ public class CommandDispatcher<S> {
             if (reader.canRead()) {
                 reader.skip();
                 if (child.getRedirect() != null) {
-                    return parseNodes(child.getRedirect(), reader, context.redirect());
+                    return parseNodes(child.getRedirect(), reader, context.redirect(child.getRedirect()));
                 } else {
                     return parseNodes(child, reader, context);
                 }

src/main/java/com/mojang/brigadier/context/CommandContextBuilder.java

@@ -63,8 +63,9 @@ public class CommandContextBuilder<S> {
         return copy;
     }
 
-    public CommandContextBuilder<S> redirect() {
+    public CommandContextBuilder<S> redirect(final CommandNode<S> newRoot) {
         final CommandContextBuilder<S> result = new CommandContextBuilder<>(dispatcher, source);
+        result.withNode(newRoot, "");
         result.parent = build();
         return result;
     }