diff --git a/Userland/Services/WindowServer/Window.cpp b/Userland/Services/WindowServer/Window.cpp
index b2d14112ed..3c648bcec5 100644
--- a/Userland/Services/WindowServer/Window.cpp
+++ b/Userland/Services/WindowServer/Window.cpp
@@ -989,6 +989,17 @@ void Window::set_parent_window(Window& parent_window)
         parent_window.add_child_window(*this);
 }
 
+Window* Window::modeless_ancestor()
+{
+    if (!is_modal())
+        return this;
+    for (auto parent = m_parent_window; parent; parent = parent->parent_window()) {
+        if (!parent->is_modal())
+            return parent;
+    }
+    return nullptr;
+}
+
 bool Window::is_accessory() const
 {
     if (!m_accessory)
diff --git a/Userland/Services/WindowServer/Window.h b/Userland/Services/WindowServer/Window.h
index bc915aa71a..6a19a51722 100644
--- a/Userland/Services/WindowServer/Window.h
+++ b/Userland/Services/WindowServer/Window.h
@@ -184,6 +184,7 @@ public:
 
     bool is_modal() const;
     bool is_modal_dont_unparent() const { return m_modal && m_parent_window; }
+    Window* modeless_ancestor();
 
     Gfx::IntRect rect() const { return m_rect; }
     void set_rect(Gfx::IntRect const&);