Qt/GeneralPane: Don't trigger config change events when populating GUI.

Source/Core/DolphinQt/QtUtils/SignalBlocking.h

@@ -0,0 +1,32 @@
+// Copyright 2022 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <QSignalBlocker>
+
+// Helper class for populating a GUI element without triggering its data change signals.
+
+template <typename T>
+class SignalBlockerProxy
+{
+public:
+  explicit SignalBlockerProxy(T* object) : m_object(object), m_blocker(object) {}
+  SignalBlockerProxy(const SignalBlockerProxy& other) = delete;
+  SignalBlockerProxy(SignalBlockerProxy&& other) = default;
+  SignalBlockerProxy& operator=(const SignalBlockerProxy& other) = delete;
+  SignalBlockerProxy& operator=(SignalBlockerProxy&& other) = default;
+  ~SignalBlockerProxy() = default;
+
+  T* operator->() const { return m_object; }
+
+private:
+  T* m_object;
+  QSignalBlocker m_blocker;
+};
+
+template <typename T>
+SignalBlockerProxy<T> SignalBlocking(T* object)
+{
+  return SignalBlockerProxy<T>(object);
+}