GameList: Fix duplicate selections with ctrl+a in grid view

Make grid view use selectedRow() instead of selectedIndexes() to ensure
one selection per game.

Source/Core/DolphinQt/GameList/GameList.cpp

@@ -286,6 +286,16 @@ void GameList::MakeGridView()
   m_grid = new QListView(this);
   m_grid->setModel(m_grid_proxy);
   m_grid->setSelectionMode(QAbstractItemView::ExtendedSelection);
+
+  // Row in this context refers to the full set of columns (banner, title, region, etc.) associated
+  // with a single game rather than multiple games presented visually on the same row. Even though
+  // most of these elements are hidden in grid view selecting all of them allows us to use
+  // selectedRow() which only returns rows where all elements are selected. In addition to improving
+  // consistency with list view this avoids an edge case where clicking a game in grid mode selected
+  // only the first element of the row but ctrl+a selected every element of the row, making a bunch
+  // of duplicate selections for each game.
+  m_grid->setSelectionBehavior(QAbstractItemView::SelectRows);
+
   m_grid->setViewMode(QListView::IconMode);
   m_grid->setResizeMode(QListView::Adjust);
   m_grid->setUniformItemSizes(true);
@@ -790,23 +800,30 @@ void GameList::ChangeDisc()
   Core::RunAsCPUThread([file_path = game->GetFilePath()] { DVDInterface::ChangeDisc(file_path); });
 }
 
-std::shared_ptr<const UICommon::GameFile> GameList::GetSelectedGame() const
+QAbstractItemView* GameList::GetActiveView() const
 {
-  QAbstractItemView* view;
-  QSortFilterProxyModel* proxy;
   if (currentWidget() == m_list)
   {
-    view = m_list;
+    return m_list;
-    proxy = m_list_proxy;
   }
-  else
+  return m_grid;
+}
+
+QSortFilterProxyModel* GameList::GetActiveProxyModel() const
+{
+  if (currentWidget() == m_list)
   {
-    view = m_grid;
+    return m_list_proxy;
-    proxy = m_grid_proxy;
   }
-  QItemSelectionModel* sel_model = view->selectionModel();
+  return m_grid_proxy;
+}
+
+std::shared_ptr<const UICommon::GameFile> GameList::GetSelectedGame() const
+{
+  QItemSelectionModel* const sel_model = GetActiveView()->selectionModel();
   if (sel_model->hasSelection())
   {
+    QSortFilterProxyModel* const proxy = GetActiveProxyModel();
     QModelIndex model_index = proxy->mapToSource(sel_model->selectedIndexes()[0]);
     return m_model.GetGameFile(model_index.row());
   }
@@ -815,27 +832,15 @@ std::shared_ptr<const UICommon::GameFile> GameList::GetSelectedGame() const
 
 QList<std::shared_ptr<const UICommon::GameFile>> GameList::GetSelectedGames() const
 {
-  QAbstractItemView* view;
-  QSortFilterProxyModel* proxy;
-  if (currentWidget() == m_list)
-  {
-    view = m_list;
-    proxy = m_list_proxy;
-  }
-  else
-  {
-    view = m_grid;
-    proxy = m_grid_proxy;
-  }
   QList<std::shared_ptr<const UICommon::GameFile>> selected_list;
-  QItemSelectionModel* sel_model = view->selectionModel();
+  QItemSelectionModel* const sel_model = GetActiveView()->selectionModel();
+
   if (sel_model->hasSelection())
   {
-    QModelIndexList index_list =
+    const QModelIndexList index_list = sel_model->selectedRows();
-        currentWidget() == m_list ? sel_model->selectedRows() : sel_model->selectedIndexes();
     for (const auto& index : index_list)
     {
-      QModelIndex model_index = proxy->mapToSource(index);
+      const QModelIndex model_index = GetActiveProxyModel()->mapToSource(index);
       selected_list.push_back(m_model.GetGameFile(model_index.row()));
     }
   }
@@ -844,8 +849,7 @@ QList<std::shared_ptr<const UICommon::GameFile>> GameList::GetSelectedGames() co
 
 bool GameList::HasMultipleSelected() const
 {
-  return currentWidget() == m_list ? m_list->selectionModel()->selectedRows().size() > 1 :
+  return GetActiveView()->selectionModel()->selectedRows().size() > 1;
-                                     m_grid->selectionModel()->selectedIndexes().size() > 1;
 }
 
 std::shared_ptr<const UICommon::GameFile> GameList::FindGame(const std::string& path) const

Source/Core/DolphinQt/GameList/GameList.h

@@ -9,6 +9,7 @@
 
 #include "DolphinQt/GameList/GameListModel.h"
 
+class QAbstractItemView;
 class QLabel;
 class QListView;
 class QSortFilterProxyModel;
@@ -87,6 +88,8 @@ private:
   void MakeEmptyView();
   // We only have two views, just use a bool to distinguish.
   void SetPreferredView(bool list);
+  QAbstractItemView* GetActiveView() const;
+  QSortFilterProxyModel* GetActiveProxyModel() const;
   void ConsiderViewChange();
   void UpdateFont();