Don't reset the item model's sort/filter options in updatePlayer (Fixes #2863)

apps/openmw/mwgui/inventorywindow.cpp

@@ -119,7 +119,12 @@ namespace MWGui
     {
         mPtr = MWBase::Environment::get().getWorld ()->getPlayerPtr();
         mTradeModel = new TradeItemModel(new InventoryItemModel(mPtr), MWWorld::Ptr());
-        mSortModel = new SortFilterItemModel(mTradeModel);
+
+        if (mSortModel) // reuse existing SortModel when possible to keep previous category/filter settings
+            mSortModel->setSourceModel(mTradeModel);
+        else
+            mSortModel = new SortFilterItemModel(mTradeModel);
+
         mItemView->setModel(mSortModel);
 
         mPreview->updatePtr(mPtr);

apps/openmw/mwgui/itemmodel.cpp

@@ -120,6 +120,11 @@ namespace MWGui
     }
 
 
+    ProxyItemModel::ProxyItemModel()
+        : mSourceModel(NULL)
+    {
+    }
+
     ProxyItemModel::~ProxyItemModel()
     {
         delete mSourceModel;
@@ -164,4 +169,18 @@ namespace MWGui
         return mSourceModel->getIndex(item);
     }
 
+    void ProxyItemModel::setSourceModel(ItemModel *sourceModel)
+    {
+        if (mSourceModel == sourceModel)
+            return;
+
+        if (mSourceModel)
+        {
+            delete mSourceModel;
+            mSourceModel = NULL;
+        }
+
+        mSourceModel = sourceModel;
+    }
+
 }

apps/openmw/mwgui/itemmodel.hpp

@@ -80,11 +80,15 @@ namespace MWGui
     class ProxyItemModel : public ItemModel
     {
     public:
+        ProxyItemModel();
         virtual ~ProxyItemModel();
         virtual MWWorld::Ptr copyItem (const ItemStack& item, size_t count, bool setNewOwner=false);
         virtual void removeItem (const ItemStack& item, size_t count);
         virtual ModelIndex getIndex (ItemStack item);
 
+        /// @note Takes ownership of the passed pointer.
+        void setSourceModel(ItemModel* sourceModel);
+
         ModelIndex mapToSource (ModelIndex index);
         ModelIndex mapFromSource (ModelIndex index);
     protected:

apps/openmw/mwgui/itemview.cpp

@@ -30,8 +30,12 @@ ItemView::~ItemView()
 
 void ItemView::setModel(ItemModel *model)
 {
+    if (mModel == model)
+        return;
+
     delete mModel;
     mModel = model;
+
     update();
 }