Don't recognize trailing comments that are separated from the node by more than one line

For example, we currently consider the indented comment below to be a trailing comment for `a();`, because it is indented more deeply than the `b();` node:

``` js
a(); // trailing comment for a()

// oddly indented comment that should lead b() rather than trailing a()
b();
```

No file or test is named. Start by reproducing the JavaScript example and trace the logic that associates comments with adjacent nodes. Done means the separated, oddly indented comment leads b(); rather than being treated as trailing a(), with a regression test covering the example.

Written by the indexing model from the issue text.