Method slice

src/editor/document.rs:209–213

(&self, start: usize, end: usize)

    }

    pub fn slice(&self, start: usize, end: usize) -> Option<RopeSlice<'_>> {
        let start = start.min(self.len_chars());
        let end = end.min(self.len_chars());
        (start < end).then(|| self.rope.slice(start..end))
    }

    pub fn to_string(&self) -> String {
        let mut text = String::with_capacity(self.rope.len_bytes());