`:ls` gives weird output

Consider following example:

```
[4] fun String.lll() = 3
[5] :ls String
fun lll(): kotlin.Int
```

I would expect to see here anything but this. By "anything" I mean only "real" members of String or "real" + extension members.

Start with the :ls command using the provided String.lll() example and inspect how members are collected for the displayed type. Reproduce the output, then define done as showing only real String members or consistently including real and extension members.

Written by the indexing model from the issue text.