[XAM] Fixed lack of UI notification for headless notifications.

- Fixes regression introduced in previous commit
- Fixed issue with multiple input if certain UI is active

src/xenia/kernel/xam/xam_input.cc

@@ -181,6 +181,10 @@ dword_result_t XamInputGetKeystrokeEx_entry(
 
   keystroke.Zero();
 
+  if (kernel_state()->xam_state()->xam_dialogs_shown_ > 0) {
+    return X_ERROR_SUCCESS;
+  }
+
   uint32_t user_index = *user_index_ptr;
   auto input_system = kernel_state()->emulator()->input_system();
   auto lock = input_system->lock();

src/xenia/kernel/xam/xam_ui.cc

@@ -140,8 +140,13 @@ X_RESULT xeXamDispatchDialogEx(
 
 X_RESULT xeXamDispatchHeadless(std::function<X_RESULT()> run_callback,
                                uint32_t overlapped) {
-  auto pre = []() {};
+  auto pre = []() {
-  auto post = []() { xe::threading::Sleep(std::chrono::milliseconds(100)); };
+    kernel_state()->BroadcastNotification(kXNotificationSystemUI, true);
+  };
+  auto post = []() {
+    xe::threading::Sleep(std::chrono::milliseconds(100));
+    kernel_state()->BroadcastNotification(kXNotificationSystemUI, false);
+  };
   if (!overlapped) {
     pre();
     auto result = run_callback();
@@ -157,8 +162,13 @@ X_RESULT xeXamDispatchHeadless(std::function<X_RESULT()> run_callback,
 X_RESULT xeXamDispatchHeadlessEx(
     std::function<X_RESULT(uint32_t&, uint32_t&)> run_callback,
     uint32_t overlapped) {
-  auto pre = []() {};
+  auto pre = []() {
-  auto post = []() { xe::threading::Sleep(std::chrono::milliseconds(100)); };
+    kernel_state()->BroadcastNotification(kXNotificationSystemUI, true);
+  };
+  auto post = []() {
+    xe::threading::Sleep(std::chrono::milliseconds(100));
+    kernel_state()->BroadcastNotification(kXNotificationSystemUI, false);
+  };
   if (!overlapped) {
     pre();
     uint32_t extended_error, length;