extract method: null checks should not miss final modifiers ( IDEA-55515 )

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

@@ -0,0 +1,13 @@
+class Test {
+  void foo() {
+    <selection>final String str = "";
+    if (str == "") {
+      return;
+    }</selection>
+    new Runnable() {
+      public void run() {
+        System.out.println(str);
+      }
+    }
+  }
+}