Qt/GeneralWidget and GraphicsWidget: Remove unused member variable

m_xrr_config was used by the GeneralWidget::GetAvailableResolutions
function to get the list of supported fullscreen resolutions when
HAVE_XRANDR was set. aa4088a removed the ability to set that resolution
in the UI, leaving the GetAvailableResolutions function unused.

m_xrr_config is initialized in MainWindow which still uses it to toggle
fullscreen, but the references in GeneralWidget and GraphicsWidget
(which just ferried m_xrr_config from MainWindow to GeneralWidget) are
now unnecessary and removed in this commit.

Source/Core/DolphinQt/Config/Graphics/GeneralWidget.cpp

@@ -26,13 +26,10 @@
 #include "DolphinQt/QtUtils/ModalMessageBox.h"
 #include "DolphinQt/Settings.h"
 
-#include "UICommon/VideoUtils.h"
-
 #include "VideoCommon/VideoBackendBase.h"
 #include "VideoCommon/VideoConfig.h"
 
-GeneralWidget::GeneralWidget(X11Utils::XRRConfiguration* xrr_config, GraphicsWindow* parent)
-    : m_xrr_config(xrr_config)
+GeneralWidget::GeneralWidget(GraphicsWindow* parent)
 {
   CreateWidgets();
   LoadSettings();

Source/Core/DolphinQt/Config/Graphics/GeneralWidget.h

@@ -16,16 +16,11 @@ class QRadioButton;
 class QGridLayout;
 class ToolTipComboBox;
 
-namespace X11Utils
-{
-class XRRConfiguration;
-}
-
 class GeneralWidget final : public GraphicsWidget
 {
   Q_OBJECT
 public:
-  explicit GeneralWidget(X11Utils::XRRConfiguration* xrr_config, GraphicsWindow* parent);
+  explicit GeneralWidget(GraphicsWindow* parent);
 signals:
   void BackendChanged(const QString& backend);
 
@@ -55,6 +50,4 @@ class GeneralWidget final : public GraphicsWidget
   ConfigBool* m_render_main_window;
   std::array<GraphicsRadioInt*, 4> m_shader_compilation_mode{};
   ConfigBool* m_wait_for_shaders;
-
-  X11Utils::XRRConfiguration* m_xrr_config;
 };

Source/Core/DolphinQt/Config/Graphics/GraphicsWindow.cpp

@@ -24,8 +24,7 @@
 #include "VideoCommon/VideoBackendBase.h"
 #include "VideoCommon/VideoConfig.h"
 
-GraphicsWindow::GraphicsWindow(X11Utils::XRRConfiguration* xrr_config, MainWindow* parent)
-    : QDialog(parent), m_xrr_config(xrr_config)
+GraphicsWindow::GraphicsWindow(MainWindow* parent) : QDialog(parent)
 {
   CreateMainLayout();
 
@@ -46,7 +45,7 @@ void GraphicsWindow::CreateMainLayout()
   main_layout->addWidget(tab_widget);
   main_layout->addWidget(button_box);
 
-  auto* const general_widget = new GeneralWidget(m_xrr_config, this);
+  auto* const general_widget = new GeneralWidget(this);
   auto* const enhancements_widget = new EnhancementsWidget(this);
   auto* const hacks_widget = new HacksWidget(this);
   auto* const advanced_widget = new AdvancedWidget(this);

Source/Core/DolphinQt/Config/Graphics/GraphicsWindow.h

@@ -16,23 +16,16 @@ class QTabWidget;
 class QDialogButtonBox;
 class SoftwareRendererWidget;
 
-namespace X11Utils
-{
-class XRRConfiguration;
-}
-
 class GraphicsWindow final : public QDialog
 {
   Q_OBJECT
 public:
-  explicit GraphicsWindow(X11Utils::XRRConfiguration* xrr_config, MainWindow* parent);
+  explicit GraphicsWindow(MainWindow* parent);
 
 signals:
   void BackendChanged(const QString& backend);
 
 private:
   void CreateMainLayout();
   void OnBackendChanged(const QString& backend);
-
-  X11Utils::XRRConfiguration* m_xrr_config;
 };

Source/Core/DolphinQt/MainWindow.cpp

@@ -1282,10 +1282,8 @@ void MainWindow::ShowGraphicsWindow()
               "display", windowHandle())),
           winId());
     }
-    m_graphics_window = new GraphicsWindow(m_xrr_config.get(), this);
-#else
-    m_graphics_window = new GraphicsWindow(nullptr, this);
 #endif
+    m_graphics_window = new GraphicsWindow(this);
     InstallHotkeyFilter(m_graphics_window);
   }