Using WinitSettings::desktop_app() does not update egui UI

[ThomasAlban]

I'm using WinitSettings::desktop_app() in my bevy app (so the window is only updated when a winit event is received or a RequestRedraw event is sent manually), but it seems that RequestRedraw events aren't sent by bevy_egui when the UI needs to be updated. This results in behaviour like this:

Screen.Recording.2024-01-01.at.23.27.09.mov

(although I click the collapsing header, it only collapses when I wiggle the mouse because that's when the next Winit event is received).

I tried to add this bevy system to the PostUpdate schedule to fix the problem:

fn redraw_window(mut contexts: EguiContexts, mut ev_request_redraw: EventWriter<RequestRedraw>) {
    let ctx = contexts.ctx_mut();
    // redraw the window if egui wants the window redrawn
    if ctx.input(|i| i.wants_repaint()) {
        ev_request_redraw.send(RequestRedraw);
    }
}

And it did partially fix it, as you can see in this screen recording:

Screen.Recording.2024-01-01.at.23.29.34.mov

But the window is still not being redrawn enough times.

Do you have any suggestions on getting this to work manually, or is there a chance this feature could be added to bevy_egui?
Thanks