System: Don't unconditionally refresh save state UI

src/core/imgui_overlays.cpp

@@ -688,6 +688,11 @@ static ImAnimatedFloat s_background_animated;
 static bool s_open = false;
 } // namespace SaveStateSelectorUI
 
+bool SaveStateSelectorUI::IsOpen()
+{
+  return s_open;
+}
+
 void SaveStateSelectorUI::Open(float open_time /* = DEFAULT_OPEN_TIME */)
 {
   s_open_time = 0.0f;

src/core/imgui_overlays.h

@@ -15,6 +15,7 @@ namespace SaveStateSelectorUI {
 
 static constexpr float DEFAULT_OPEN_TIME = 5.0f;
 
+bool IsOpen();
 void Open(float open_time = DEFAULT_OPEN_TIME);
 void RefreshList();
 void DestroyTextures();

src/core/system.cpp

@@ -3366,7 +3366,8 @@ void System::UpdateRunningGame(const char* path, CDImage* image, bool booting)
   if (s_running_game_serial != prev_serial)
     UpdateSessionTime(prev_serial);
 
-  SaveStateSelectorUI::RefreshList();
+  if (SaveStateSelectorUI::IsOpen())
+    SaveStateSelectorUI::RefreshList();
 
 #ifdef ENABLE_DISCORD_PRESENCE
   UpdateDiscordPresence();