Handle inner method invocations first

src/core/lombok/javac/handlers/HandleExtensionMethod.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012-2014 The Project Lombok Authors.
+ * Copyright (C) 2012-2021 The Project Lombok Authors.
  * 
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -152,8 +152,9 @@ public void replace() {
 
 		@Override
 		public Void visitMethodInvocation(final MethodInvocationTree tree, final Void p) {
+			super.visitMethodInvocation(tree, p);
 			handleMethodCall((JCMethodInvocation) tree);
-			return super.visitMethodInvocation(tree, p);
+			return null;
 		}
 
 		private void handleMethodCall(final JCMethodInvocation methodCall) {

test/transform/resource/after-delombok/ExtensionMethodChain.java

@@ -0,0 +1,15 @@
+import java.util.Arrays;
+import java.util.List;
+
+class ExtensionMethodChain {
+	public void test() {
+		ExtensionMethodChain.Extensions.intValue("1").intValue();
+	}
+
+
+	static class Extensions {
+		public static Integer intValue(String s) {
+			return Integer.valueOf(s);
+		}
+	}
+}

test/transform/resource/after-ecj/ExtensionMethodChain.java

@@ -0,0 +1,19 @@
+import java.util.Arrays;
+import java.util.List;
+import lombok.experimental.ExtensionMethod;
+@ExtensionMethod(ExtensionMethodChain.Extensions.class) class ExtensionMethodChain {
+  static class Extensions {
+    Extensions() {
+      super();
+    }
+    public static Integer intValue(String s) {
+      return Integer.valueOf(s);
+    }
+  }
+  ExtensionMethodChain() {
+    super();
+  }
+  public void test() {
+    ExtensionMethodChain.Extensions.intValue("1").intValue();
+  }
+}

test/transform/resource/before/ExtensionMethodChain.java

@@ -0,0 +1,17 @@
+import java.util.Arrays;
+import java.util.List;
+import lombok.experimental.ExtensionMethod;
+
+@ExtensionMethod(ExtensionMethodChain.Extensions.class)
+class ExtensionMethodChain {
+
+	public void test() {
+		"1".intValue().intValue();
+	}
+
+	static class Extensions {
+		public static Integer intValue(String s) {
+			return Integer.valueOf(s);
+		}
+	}
+}