Partial include should show full file instead of stub when showing hidden lines.

[shingtaklam1324]

Currently, when parts of the code is included, the default stub is included.

[Michael-F-Bryan]

Would you be able to show us an example of what you see versus what you expected to happen?

[carols10cents]

Ok I think I understand this one because I think I'm having the same issue.

When I have an external file that, say, looks like this:

struct User {
    username: String,
    email: String,
    sign_in_count: u64,
    active: bool,
}

fn main() {
    let user1 = User {
        email: String::from("someone@example.com"),
        username: String::from("someusername123"),
        active: true,
        sign_in_count: 1,
    };
}

And I include part of the file like this:

```rust
{{#include ../examples/ch05-using-structs-to-structure-related-data/listing-05-02/src/main.rs:9:14}}
```

I correctly see the part of the file rendered:

But when I click the "show hidden lines" link, I see this:

The example has been wrapped in main and the allow(unused_variables) has been added. I think that's what @shingtaklam1324 means by "default stub".

What would be nice is if clicking the "show hidden lines" link expanded to show the rest of the file instead, and only wrapping in main if the rest of the file didn't have main.

I'm working on extracting TRPL's examples into external files, and this would be really nice to have. I'll probably give this a try soon.