Method insert

src/buffer.rs:261–273

(&mut self, ch: char)

    }

    pub fn insert(&mut self, ch: char) {
        self.edited = true;
        if ch == '\n' {
            let col = self.cursor_col;
            let line = self.cur_line_mut();
            let last_half = line.split_off(col);
            self.lines.insert(self.cursor_row + 1, last_half);
        } else {
            let col = self.cursor_col;
            self.cur_line_mut().insert(col, ch);
        }
        self.move_cur(Direction::Right);
    }

    pub fn delete(&mut self) -> Option<char> {
        self.edited = true;