InputManager: Don't load bindings for inactive multitap ports

src/core/settings.h

@@ -267,6 +267,10 @@ struct Settings
   {
     return (multitap_mode == MultitapMode::Port1Only || multitap_mode == MultitapMode::BothPorts);
   }
+  ALWAYS_INLINE bool IsMultitapPortEnabled(u32 port) const
+  {
+    return (port == 0) ? IsPort1MultitapEnabled() : IsPort2MultitapEnabled();
+  }
 
   ALWAYS_INLINE static bool IsPerGameMemoryCardType(MemoryCardType type)
   {

src/frontend-common/input_manager.cpp

@@ -924,6 +924,13 @@ void InputManager::CopyConfiguration(SettingsInterface* dest_si, const SettingsI
 
   for (u32 port = 0; port < NUM_CONTROLLER_AND_CARD_PORTS; port++)
   {
+    if (Controller::PadIsMultitapSlot(port))
+    {
+      const auto [mt_port, mt_slot] = Controller::ConvertPadToPortAndSlot(port);
+      if (!g_settings.IsMultitapPortEnabled(mt_port))
+        continue;
+    }
+
     const std::string section(Controller::GetSettingsSection(port));
     const std::string type(src_si.GetStringValue(section.c_str(), "Type", Controller::GetDefaultPadType(port)));
     if (copy_pad_config)