Fix selection in generic wxDataViewCtrl after adding an item

Notify m_selection about the new item in all cases, not just when using
a virtual list model.

This was broken back in 36a5983f64 and
only fixed for virtual list controls, but not all the other ones, in
9f5af0a494.

src/generic/datavgen.cpp

@@ -2768,8 +2768,6 @@ bool wxDataViewMainWindow::ItemAdded(const wxDataViewItem & parent, const wxData
         wxDataViewVirtualListModel *list_model =
             (wxDataViewVirtualListModel*) GetModel();
         m_count = list_model->GetCount();
-
-        m_selection.OnItemsInserted(GetRowByItem(item), 1);
     }
     else
     {
@@ -2860,6 +2858,8 @@ bool wxDataViewMainWindow::ItemAdded(const wxDataViewItem & parent, const wxData
         InvalidateCount();
     }
 
+    m_selection.OnItemsInserted(GetRowByItem(item), 1);
+
     GetOwner()->InvalidateColBestWidths();
     UpdateDisplay();