fix: retrack application when guest applet is closed

src/core/hle/service/am/applet_manager.cpp

@@ -1,4 +1,5 @@
 // SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2024 suyu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include "common/settings.h"
@@ -335,4 +336,8 @@ void AppletManager::SetWindowSystem(WindowSystem* window_system) {
     applet->process->Run();
 }
 
+void AppletManager::ReTrackApplication(std::shared_ptr<Applet> applet) {
+    m_window_system->RequestApplicationToGetForeground();
+}
+
 } // namespace Service::AM

src/core/hle/service/am/applet_manager.h

@@ -1,4 +1,5 @@
 // SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2024 suyu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #pragma once
@@ -46,6 +47,7 @@ public:
 
 public:
     void SetWindowSystem(WindowSystem* window_system);
+    void ReTrackApplication(std::shared_ptr<Applet> applet);
 
 private:
     Core::System& m_system;

src/core/hle/service/am/service/library_applet_accessor.cpp

@@ -1,4 +1,5 @@
 // SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2024 suyu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include "core/hle/service/am/applet_data_broker.h"
@@ -101,6 +102,12 @@ Result ILibraryAppletAccessor::PushInData(SharedPointer<IStorage> storage) {
 
 Result ILibraryAppletAccessor::PopOutData(Out<SharedPointer<IStorage>> out_storage) {
     LOG_DEBUG(Service_AM, "called");
+    if(!m_applet->caller_applet.expired()) {
+        LOG_DEBUG(Service_AM, "resuming caller");
+        system.GetAppletManager().ReTrackApplication(m_applet->caller_applet.lock());
+    } else {
+        LOG_CRITICAL(Service_AM, "Failed to track application. The emulator will freeze!");
+    }
     R_RETURN(m_broker->GetOutData().Pop(out_storage.Get()));
 }