introduce functional variable: encode this (IDEA-174203)

java/java-tests/testData/refactoring/introduceFunctionalVariable/afterChangeContextBeforePuttingIntoAnonymous.java

@@ -0,0 +1,9 @@
+import java.util.function.Function;
+
+class Test {
+    String string;
+    void useThis() {
+        Function<String, String> stringStringFunction = string -> string;
+        System.out.println(stringStringFunction.apply(string));
+    }
+}

java/java-tests/testData/refactoring/introduceFunctionalVariable/beforeChangeContextBeforePuttingIntoAnonymous.java

@@ -0,0 +1,6 @@
+class Test {
+    String string;
+    void useThis() {
+        System.out.println(<selection>this.string</selection>);
+    }
+}