Add a custom role used to sort the tags with an upcoming proxy model

src/model/danboorutagmodel.cpp

@@ -56,6 +56,8 @@ QVariant DanbooruTagModel::data(const QModelIndex &index, int role) const
         return i18np("%1 (%2 post)", "%1 (%2 posts)", tag->name(), tag->count());
     } else if (role == Qt::ToolTipRole) {
         return i18n("Tag count: %1", tag->count());
+    } else if (role == TagCountRole) {
+        return tag->count();
     }
 
     // TODO: More roles depending on the type of information

src/model/danboorutagmodel.h

@@ -40,6 +40,11 @@ public:
     void clear();
     DanbooruTag* itemAt(int index) const;
 
+    enum TagRoles {
+        // Needed for sorting through the proxy model
+        TagCountRole = Qt::UserRole + 4000
+    };
+
 private:
     QVector<DanbooruTag*> m_items;