DolphinQt: Add Show/Hide All options to gamelist region menu

Source/Core/DolphinQt/MenuBar.cpp

@@ -695,20 +695,29 @@ void MenuBar::AddShowRegionsMenu(QMenu* view_menu)
       {tr("Show World"), &SConfig::GetInstance().m_ListWorld},
       {tr("Show Unknown"), &SConfig::GetInstance().m_ListUnknown}};
 
-  QActionGroup* region_group = new QActionGroup(this);
-  QMenu* region_menu = view_menu->addMenu(tr("Show Regions"));
-  region_group->setExclusive(false);
+  QMenu* const region_menu = view_menu->addMenu(tr("Show Regions"));
+  const QAction* const show_all_regions = region_menu->addAction(tr("Show All"));
+  const QAction* const hide_all_regions = region_menu->addAction(tr("Hide All"));
+  region_menu->addSeparator();
 
   for (const auto& key : region_map.keys())
   {
-    bool* config = region_map[key];
-    QAction* action = region_group->addAction(region_menu->addAction(key));
-    action->setCheckable(true);
-    action->setChecked(*config);
-    connect(action, &QAction::toggled, [this, config, key](bool value) {
-      *config = value;
-      emit GameListRegionVisibilityToggled(key, value);
-    });
+    bool* const config = region_map[key];
+    QAction* const menu_item = region_menu->addAction(key);
+    menu_item->setCheckable(true);
+    menu_item->setChecked(*config);
+
+    const auto SetVisibility = [this, config, key, menu_item](bool visibility) {
+      menu_item->setChecked(visibility);
+      *config = visibility;
+      emit GameListRegionVisibilityToggled(key, visibility);
+    };
+    const auto SetVisible = std::bind(SetVisibility, true);
+    const auto SetHidden = std::bind(SetVisibility, false);
+
+    connect(menu_item, &QAction::toggled, SetVisibility);
+    connect(show_all_regions, &QAction::triggered, menu_item, SetVisible);
+    connect(hide_all_regions, &QAction::triggered, menu_item, SetHidden);
   }
 }