Fold action does not always fold the inner most uncollapsed region

[weinand]

On testing #2994

In the following snippet place the caret on 'hello' and perform a 'Fold' operation:

class xyz {
    foo() {
        if (a == b) {   
            hello
        } else {
            world
        }
    }
}

Observe: 'foo()' get collapsed but I would expect that the 'if' gets collapsed.

[aeschli]

duplicate of #3398