From 4bb7970234691d9849cc6c645c8026f0c2769333 Mon Sep 17 00:00:00 2001
From: Skyler Lehmkuhl <skycooler@gmail.com>
Date: Tue, 14 Jul 2026 13:22:48 -0400
Subject: [PATCH] Keep menus alive for submenu interaction

---
 crates/egui/src/containers/menu.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/crates/egui/src/containers/menu.rs b/crates/egui/src/containers/menu.rs
index f2aaee04..a0caea51 100644
--- a/crates/egui/src/containers/menu.rs
+++ b/crates/egui/src/containers/menu.rs
@@ -515,6 +515,13 @@ impl SubMenu {
                 content(ui)
             });
 
+        if let Some(_) = &popup_response {
+            // Keep the submenu alive so `from_id`'s staleness check doesn't close it.
+            // Without this, menus whose content has no further SubMenuButtons never update
+            // `last_visible_pass`, causing the parent to reset `open_item` after ~2 frames.
+            MenuState::mark_shown(ui.ctx(), id);
+        }
+
         if let Some(popup_response) = &popup_response {
             // If no child sub menu is open means we must be the deepest child sub menu.
             let is_deepest_submenu = MenuState::is_deepest_open_sub_menu(ui.ctx(), id);