extract method: new signature detector: add unused parameters to method calls as refs to initial vars

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

@@ -0,0 +1,9 @@
+public class Test {
+    {
+        int x = 0;
+
+        <selection>System.out.println("foo".substring(x));</selection>
+
+        System.out.println("bar".substring(x));
+    }
+}

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

@@ -0,0 +1,13 @@
+public class Test {
+    {
+        int x = 0;
+
+        newMethod(x, "foo".substring(x));
+
+        newMethod(x, "bar".substring(x));
+    }
+
+    private void newMethod(int x, String substring) {
+        System.out.println(substring);
+    }
+}