FIX: the text shape is affected by instance transformation

Change-Id: If2222a24056bbc1636b5da586e6cc1950d8cdb5a
(cherry picked from commit 996d013c2e7f1bdbdc4afbac540f99a20b063cca)

src/slic3r/GUI/GUI_ObjectList.hpp

@@ -452,6 +452,9 @@ private:
 	void OnEditingStarted(wxDataViewEvent &event);
     void OnEditingDone(wxDataViewEvent &event);
 
+    // apply the instance transform to all volumes and reset instance transform except the offset
+    void apply_object_instance_transfrom_to_all_volumes(ModelObject *model_object);
+
     std::vector<int> m_columns_width;
 };