extract method: search deep for type parameters used in extracted fragment

java/java-tests/testData/refactoring/extractMethod/ComplexTypeParams.java

@@ -0,0 +1,9 @@
+import java.util.List;
+
+public class Test
+{
+   <T> void foo(List<? extends List<T>> tr){
+      <selection> tr.add(null);</selection>
+   }
+
+}

java/java-tests/testData/refactoring/extractMethod/ComplexTypeParams_after.java

@@ -0,0 +1,13 @@
+import java.util.List;
+
+public class Test
+{
+   <T> void foo(List<? extends List<T>> tr){
+       newMethod(tr);
+   }
+
+    private <T> void newMethod(List<? extends List<T>> tr) {
+        tr.add(null);
+    }
+
+}