LibGUI: Add GUI::Menu::try_add_submenu()

This is a fallible variant of add_submenu() that returns ErrorOr.

1 files changed, 2 insertions, 1 deletions

diff --git a/Userland/Libraries/LibGUI/Menu.h b/Userland/Libraries/LibGUI/Menu.h
index 8b2b8dccea..de83bdb167 100644
--- a/Userland/Libraries/LibGUI/Menu.h
+++ b/Userland/Libraries/LibGUI/Menu.h
@@ -34,10 +34,11 @@ public:
 
     ErrorOr<void> try_add_action(NonnullRefPtr<Action>);
     ErrorOr<void> try_add_separator();
+    ErrorOr<NonnullRefPtr<Menu>> try_add_submenu(String name);
 
     void add_action(NonnullRefPtr<Action>);
     void add_separator();
-    Menu& add_submenu(const String& name);
+    Menu& add_submenu(String name);
 
     void popup(const Gfx::IntPoint& screen_position, const RefPtr<Action>& default_action = nullptr);
     void dismiss();