NotificationServer: Reposition notifications on screen resolution change

Previously notifications were (partially) drawn outside the screen rect if
they were created before changing the screen resolution to smaller
dimensions. This prevented the user from dismissing the notification as the
close button was no longer clickable.

Services/NotificationServer/NotificationWindow.cpp

@@ -41,7 +41,7 @@ namespace NotificationServer {
 
 static Vector<RefPtr<NotificationWindow>> s_windows;
 
-static void update_notification_window_locations()
+void update_notification_window_locations()
 {
  Gfx::IntRect last_window_rect;
  for (auto& window : s_windows) {

Services/NotificationServer/NotificationWindow.h

@@ -30,6 +30,8 @@
 
 namespace NotificationServer {
 
+void update_notification_window_locations();
+
 class NotificationWindow final : public GUI::Window {
  C_OBJECT(NotificationWindow);
 

Services/NotificationServer/main.cpp

@@ -25,8 +25,10 @@
  */
 
 #include "ClientConnection.h"
+#include "NotificationWindow.h"
 #include <LibCore/LocalServer.h>
 #include <LibGUI/Application.h>
+#include <LibGUI/Desktop.h>
 #include <LibGUI/WindowServerConnection.h>
 #include <stdio.h>
 #include <unistd.h>
@@ -66,5 +68,7 @@ int main(int argc, char** argv)
  return 1;
  }
 
+ GUI::Desktop::the().on_rect_change = [](auto&) { NotificationServer::update_notification_window_locations(); };
+
  return app->exec();
 }