Backspace character doesn't get rendered

[FalconSN]

My App::new function is like this:

impl App {
    pub fn new(cc: &eframe::CreationContext<'_>) -> Self {
        // storage load process ...

        let mut fonts = egui::FontDefinitions::empty();
        fonts.font_data.insert(
            "my_font".to_string(),
            std::sync::Arc::new(egui::FontData::from_static(include_bytes!(
                "../0xProtoNerdFont-Regular.ttf"
            ))),
        );
        fonts
            .families
            .entry(FontFamily::Proportional)
            .or_default()
            .insert(0, "my_font".to_string());
        fonts
            .families
            .entry(FontFamily::Monospace)
            .or_default()
            .insert(0, "my_font".to_string());
        cc.egui_ctx.set_fonts(fonts);
        return s;
    }
}

And I'm adding a button to a grid with backspace character (\u{232b} or ⌫)

if grid.small_button("\u{232b}").clicked() {
    self.delete_product.insert((
        product.brand.to_string(),
        index,
        product.id,
    ));
}

This font should be able to render this character, I'm using it in kitty terminal and echo -e "\u232b" prints it correctly. What am I missing? I tested to see if it's a button problem, but it doesn't render in a label either and replaced by ?.

[YgorSouza]

I tried with a different font and the character is displayed correctly:

use eframe::egui::{self, FontFamily};

fn main() -> eframe::Result {
    let options = eframe::NativeOptions {
        viewport: egui::ViewportBuilder::default().with_inner_size([320.0, 240.0]),
        ..Default::default()
    };

    eframe::run_simple_native("My egui App", options, move |ctx, _frame| {
        let mut fonts = egui::FontDefinitions::empty();
        fonts.font_data.insert(
            "my_font".to_string(),
            std::sync::Arc::new(egui::FontData::from_static(include_bytes!(
                "../FiraCodeNerdFont-Retina.ttf"
            ))),
        );
        for family in [FontFamily::Proportional, FontFamily::Monospace] {
            fonts
                .families
                .entry(family)
                .or_default()
                .insert(0, "my_font".to_string());
        }
        ctx.set_fonts(fonts);
        egui::CentralPanel::default().show(ctx, |ui| {
            ui.heading("⌫");
            ui.label("⌫");
            ui.monospace("⌫");
        });
    })
}

(using `"u{232b}" works the same)

But with the SourceCodePro font, it displays a question mark as well, although it is rendered in kitty:

It could be that some fonts have an unusual mapping that kitty knows how to deal with and egui doesn't, or it could be that the font doesn't actually have this character, and kitty is getting it from a fallback font. I'm leaning towards the latter, because if I set the kitty font to an invalid name, it uses some default font and this character is still displayed, and looks the same as it does with SourceCodePro:

[FalconSN]

or it could be that the font doesn't actually have this character, and kitty is getting it from a fallback font.

Oh, it looks like you're right about that. I'm using 0xProto in Termux too and thought the font actually supports this character. When I changed the font to default, backspace character looks the same. I didn't know there is this possibility. Thank you!