Multines include #2830

Problem

Multilines includes which are nested into markdown structures (like quote blocks for instance) brake the markdown compilation.

Steps

When you preprocess this markdown

> Quoted inclusion
> ```rust
> {{#include hello_world.rs}}
> ```

with multilines file hello_world.rs like

pub fn main() {
    println!("Hello, World")
}

you get

> Quoted inclusion
> ```rust
> pub fn main() {
    println!("Hello, World")
}
> ```

which breaks the markdown compilation

Possible Solution(s)

No response

Notes

No response

Version

mdbook v0.5.0-alpha.1