WindowServer: Allow each WindowStack to have an active window

A window with an inner stack needs to keep track of which inner window
is active.

1 files changed, 5 insertions, 0 deletions

diff --git a/Userland/Services/WindowServer/WindowStack.h b/Userland/Services/WindowServer/WindowStack.h
index 6a2b7fb97a..768134c255 100644
--- a/Userland/Services/WindowServer/WindowStack.h
+++ b/Userland/Services/WindowServer/WindowStack.h
@@ -40,8 +40,13 @@ public:
     Window const* highlight_window() const { return m_highlight_window; }
     void set_highlight_window(Window*);
 
+    Window* active_window() { return m_active_window; }
+    Window const* active_window() const { return m_active_window; }
+    void set_active_window(Window*);
+
 private:
     WeakPtr<Window> m_highlight_window;
+    WeakPtr<Window> m_active_window;
 
     Window::List m_windows;
 };