emilk/egui · error

We should always find the root

Error message

We should always find the root

What it means

Error "We should always find the root" thrown in emilk/egui.

Source

Thrown at crates/egui/src/containers/menu.rs:40

pub fn menu_style(style: &mut Style) {
    style.spacing.button_padding = vec2(2.0, 0.0);
    style.visuals.widgets.active.bg_stroke = Stroke::NONE;
    style.visuals.widgets.open.bg_stroke = Stroke::NONE;
    style.visuals.widgets.hovered.bg_stroke = Stroke::NONE;
    style.visuals.widgets.inactive.weak_bg_fill = Color32::TRANSPARENT;
    style.visuals.widgets.inactive.bg_stroke = Stroke::NONE;
}

/// Find the root [`UiStack`] of the menu.
pub fn find_menu_root(ui: &Ui) -> &UiStack {
    ui.stack()
        .iter()
        .find(|stack| {
            stack.is_root_ui()
                || [Some(UiKind::Popup), Some(UiKind::Menu)].contains(&stack.kind())
                || stack.info.tags.contains(MenuConfig::MENU_CONFIG_TAG)
        })
        .expect("We should always find the root")
}

/// Is this Ui part of a menu?
///
/// Returns `false` if this is a menu bar.
/// Should be used to determine if we should show a menu button or submenu button.
pub fn is_in_menu(ui: &Ui) -> bool {
    for stack in ui.stack().iter() {
        if let Some(config) = stack
            .info
            .tags
            .get_downcast::<MenuConfig>(MenuConfig::MENU_CONFIG_TAG)
        {
            return !config.bar;
        }
        if [Some(UiKind::Popup), Some(UiKind::Menu)].contains(&stack.kind()) {
            return true;
        }

View on GitHub (pinned to d802a982ce)

When it happens

Trigger: Thrown at crates/egui/src/containers/menu.rs:40 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of emilk/egui@d802a982ce (2026-08-16). Data as JSON: /api/errors/e224515e84b4caf1. Report an issue: GitHub.