extract method: exclude unused type parameters mentioned in return type (IDEA-58456)

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

@@ -0,0 +1,10 @@
+class Test {
+  public <T> T method(Class<T> clazz) {
+      newMethod();
+      return null;
+  }
+
+    private void newMethod() {
+        System.out.println();
+    }
+}