System: Use Async HC mode disable for resuming

src/core/system.cpp

@@ -1355,14 +1355,36 @@ bool System::BootSystem(SystemBootParameters parameters)
   }
 
   // Check for resuming with hardcore mode.
-  if (!parameters.save_state.empty() && Achievements::IsHardcoreModeActive() &&
+  if (parameters.disable_achievements_hardcore_mode)
-      !Achievements::ConfirmHardcoreModeDisable(TRANSLATE("Achievements", "Resuming state")))
+    Achievements::DisableHardcoreMode();
+  if (!parameters.save_state.empty() && Achievements::IsHardcoreModeActive())
+  {
+    bool cancelled;
+    if (FullscreenUI::IsInitialized())
+    {
+      Achievements::ConfirmHardcoreModeDisableAsync(TRANSLATE("Achievements", "Resuming state"),
+                                                    [parameters = std::move(parameters)](bool approved) mutable {
+                                                      if (approved)
+                                                      {
+                                                        parameters.disable_achievements_hardcore_mode = true;
+                                                        BootSystem(std::move(parameters));
+                                                      }
+                                                    });
+      cancelled = true;
+    }
+    else
+    {
+      cancelled = !Achievements::ConfirmHardcoreModeDisable(TRANSLATE("Achievements", "Resuming state"));
+    }
+
+    if (cancelled)
     {
       s_state = State::Shutdown;
       ClearRunningGame();
       Host::OnSystemDestroyed();
       return false;
     }
+  }
 
   // Load BIOS image.
   if (!LoadBIOS(parameters.override_bios))

src/core/system.h

@@ -50,6 +50,7 @@ struct SystemBootParameters
   bool load_image_to_ram = false;
   bool force_software_renderer = false;
   bool fast_forward_to_first_frame = false;
+  bool disable_achievements_hardcore_mode = false;
 };
 
 struct SaveStateInfo