Should be a const ptr.

cockatrice/src/dlg_filter_games.cpp

@@ -13,7 +13,7 @@
 #include <QSettings>
 #include <QCryptographicHash>
 
-DlgFilterGames::DlgFilterGames(const QMap<int, QString> &_allGameTypes, GamesProxyModel *_gamesProxyModel, QWidget *parent)
+DlgFilterGames::DlgFilterGames(const QMap<int, QString> &_allGameTypes, const GamesProxyModel *_gamesProxyModel, QWidget *parent)
     : QDialog(parent),
       allGameTypes(_allGameTypes),
       gamesProxyModel(_gamesProxyModel)

cockatrice/src/dlg_filter_games.h

@@ -23,7 +23,7 @@ private:
 
     const QMap<int, QString> &allGameTypes;
     // This needs a const someplace
-    GamesProxyModel *gamesProxyModel;
+    const GamesProxyModel *gamesProxyModel;
 
     /*
      * The game type might contain special characters, so to use it in
@@ -33,7 +33,7 @@ private:
 private slots:
     void actOk();
 public:
-    DlgFilterGames(const QMap<int, QString> &_allGameTypes, GamesProxyModel *_gamesProxyModel, QWidget *parent = 0);
+    DlgFilterGames(const QMap<int, QString> &_allGameTypes, const GamesProxyModel *_gamesProxyModel, QWidget *parent = 0);
 
     bool getUnavailableGamesVisible() const;
     void setUnavailableGamesVisible(bool _unavailableGamesVisible);