custom_font example not working with sdl2 backend

[deets]

The title pretty much says it. I've followed the custom_font.rs-example, but put it on my project using the SDL2 backend (egui_sdl2_platform = { version="0.2.2", path="./modules/egui_sdl2_platform" , features=["sdl2_ttf"]}).

It registers the font alright, but then when attempting to access the fonts (and printing the registered ones for inspection first), the program crashes.

    ui.fonts(|fonts| {
        for family in fonts.families() {
            println!("family: {:?}", family)
        }
    });

    ui.label("Hello, world!");
    ui.label(
        RichText::new("AMIGA")
            .size(16.0)
            .family(FontFamily::Name("amiga4ever".into())),
    );

puts out

family: Proportional
family: Monospace
thread 'main' panicked at /Users/deets/.cargo/registry/src/index.crates.io-6f17d22bba15001f/epaint-0.21.0/src/text/fonts.rs:624:21:

In my attempt to investigate this, I discovered

egui/crates/egui/src/context.rs

Line 1345 in 5cf8a08

self.memory_mut(|mem| mem.new_font_definitions = Some(font_definitions));

which is where the trail ends for me - this variable is never read in a way that I can figure out.

Any suggestions are very welcome.

[deets]

Here is the font adding code, just for reference (pretty much unchanged from the example, just priorities are set to highest in both cases)

pub fn setup_custom_fonts(ctx: &egui::Context) {
    // Start with the default fonts (we will be adding to them rather than replacing them).
    let mut fonts = egui::FontDefinitions::default();

    // Install my own font (maybe supporting non-latin characters).
    // .ttf and .otf files supported.
    fonts.font_data.insert(
        "amiga4ever".to_owned(),
        egui::FontData::from_static(include_bytes!("../resources/amiga4ever-pro2.ttf")),
    );

    // Put my font first (highest priority) for proportional text:
    fonts
        .families
        .entry(egui::FontFamily::Proportional)
        .or_default()
        .insert(0, "amiga4ever".to_owned());

    // Put my font as last fallback for monospace:
    fonts
        .families
        .entry(egui::FontFamily::Monospace)
        .or_default()
        .insert(0, "amiga4ever".to_owned());

    // Tell egui to use these fonts:
    for family in &fonts.families {
        println!("family: {:?}", family);
    }
    ctx.set_fonts(fonts);
}

[deets]

After some more digging, I found the location where new_font_definitions is accessed. And then I was eventually able to see that a method update_fonts_mut needed to be invoked, which in turn was triggered by requesting a new context from the SDL2 platform. And somehow I didn't do that, and because of that the font never became active.

The whole families thing wasn't right either. But now stuff works, maybe somebody stumbles over this as well. I presume a more polished SDL2 integration (similar to eframe) would help, maybe I have a crack on that.