Tests the gutter decorations in target source code after ScriptFormatterEditorAction

0: + function outer(index) {
1:   
2: -     function inner1(a) {
3: -         return a + 1;
4: -     }
5:   
6: +     function inner2(a) {
7: +         return a + 2;
8: +     }
9:   
10: -     function inner3(a) {
11: -         return a + 3;
12: -     }
13: +     function inner4(a) {
14: +         return a + 4;
15: +     }
16: -     function inner5(a) {
17: -         return a + 5;
18: -     }
19:   
20: +     if (index === 7) {
21: -         console.error('This will never happen!');
22: -     }
23:   
24: +     // Make sure these are not collected.
25: +     if (!self.__funcs)
26: +         self.__funcs = [inner1, inner2, inner3, inner4, inner5];
27: +     return self.__funcs[index];
28: + }
29:   
30: + function performActions() {
31: +     return outer(1)(0) + outer(3)(0);
32: + }
33: - function outer2() {
34: -     return outer(0)(0);
35: - }
36: