You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: layout.rs
    path of file: ./repos/floem/src/views/editor
    
    the code of the file until where you have to start completion: use crate::{
    cosmic_text::{LayoutLine, TextLayout},
    peniko::Color,
};
use floem_editor_core::buffer::rope_text::RopeText;

use super::visual_line::TextLayoutProvider;

#[derive(Clone, Debug)]
pub struct LineExtraStyle {
    pub x: f64,
    pub y: f64,
    pub width: Option<f64>,
    pub height: f64,
    pub bg_color: Option<Color>,
    pub under_line: Option<Color>,
    pub wave_lin
    
    pub fn relevant_layouts(&self) -> impl Iterator<Item = &'_ LayoutLine> + '_ {
        // Even though we only have one hard line (and thus only one `lines` entry) typically, for
        // normal buffer lines, we can have more than one due to multiline phantom text. So we have
        // to sum over all of the entries line counts.
        self.text
            .lines
            .iter()
            .flat_map(|l| l.layout_opt().as_deref())
            .flat_map(|ls| ls.iter())
            .filter(|l| !l.glyphs.is_empty())
    }