SystemMenu: Don't exit if the shutdown dialog is opened but cancelled

Previously opening the shutdown dialog and cancelling out of it would
cause SystemMenu to exit due to the exit-when-there-are-no-more-windows
mechanism in GUI::Application. Fix this by opting out of it.

1 files changed, 1 insertions, 0 deletions

diff --git a/Services/SystemMenu/main.cpp b/Services/SystemMenu/main.cpp
index 3214557d6c..3cf4c064db 100644
--- a/Services/SystemMenu/main.cpp
+++ b/Services/SystemMenu/main.cpp
@@ -65,6 +65,7 @@ static NonnullRefPtr<GUI::Menu> build_system_menu();
 int main(int argc, char** argv)
 {
     GUI::Application app(argc, argv);
+    app.set_quit_when_last_window_deleted(false);
 
     auto menu = build_system_menu();
     menu->realize_menu_if_needed();