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Weird formatting with fold: true #56

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@Inky-developer

Description

@Inky-developer

When rendering an annotation with fold: true the first 4 lines get rendered if the source has more than 7 lines.
If the source has 7 or less lines, the first lines do not get rendered.

Example with source = "\n\n\n\n\n\n\nFoo":

error
  |
...
8 | Foo
  | ^^^ Error here
  |

Example with source = "\n\n\n\n\n\n\n\nFoo":

error
  |
1 | 
2 | 
3 | 
4 | 
...
8 | 
9 | Foo
  | ^^^ Error here
  |

Minimal example:

use annotate_snippets::{
    display_list::{DisplayList, FormatOptions},
    snippet::{Annotation, AnnotationType, Slice, Snippet, SourceAnnotation},
};

fn print_snippet(source: &str, range: (usize, usize)) {
    let s = Snippet {
        title: Some(Annotation {
            label: None,
            id: None,
            annotation_type: AnnotationType::Error,
        }),
        footer: Vec::new(),
        slices: vec![Slice {
            fold: true,
            line_start: 1,
            source,
            origin: None,
            annotations: vec![SourceAnnotation {
                annotation_type: AnnotationType::Error,
                label: "Error here",
                range,
            }],
        }],
        opt: FormatOptions::default(),
    };
    println!("{}", DisplayList::from(s));
}

fn main() {
    print_snippet("\n\n\n\n\n\n\nFoo", (7, 10));
    println!("\nVs\n");
    print_snippet("\n\n\n\n\n\n\n\nFoo", (8, 11));
}

I am not sure if this is intended. In either case there should probably some way to disable this behavior.

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