Java: Don't fold too complex expressions when extracting method (IDEA-175221, IDEA-167255)

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

@@ -0,0 +1,9 @@
+class C {
+    int foo(String[] vars, int i) {
+        return newMethod(vars[i]);
+    }
+
+    private int newMethod(String var) {
+        return var.length();
+    }
+}