Fix the crash issue when select filament in per-object editting

Change-Id: I02be1b93f3b6df22843ac33ae565167711ffaf4a

src/slic3r/GUI/GUI_ObjectTable.cpp

@@ -236,6 +236,25 @@ void GridCellFilamentsEditor::BeginEdit(int row, int col, wxGrid* grid)
     }
 }
 
+bool GridCellFilamentsEditor::EndEdit(int WXUNUSED(row),
+                                     int WXUNUSED(col),
+                                     const wxGrid* WXUNUSED(grid),
+                                     const wxString& WXUNUSED(oldval),
+                                     wxString *newval)
+{
+    const wxString value = Combo()->GetValue();
+    if ( value == m_value )
+        return false;
+
+    m_value = value;
+
+    if ( newval )
+        *newval = value;
+
+    return true;
+}
+
+
 wxGridActivationResult GridCellFilamentsEditor::TryActivate(int row, int col, wxGrid* grid, const wxGridActivationSource& actSource)
 {
     ObjectGridTable *table = dynamic_cast<ObjectGridTable *>(grid->GetTable());

src/slic3r/GUI/GUI_ObjectTable.hpp

@@ -71,6 +71,8 @@ public:
     virtual wxGridCellEditor *Clone() const wxOVERRIDE;
 
     virtual void BeginEdit(int row, int col, wxGrid* grid) wxOVERRIDE;
+    virtual bool EndEdit(int row, int col, const wxGrid* grid,
+                         const wxString& oldval, wxString *newval) wxOVERRIDE;
 
     virtual wxGridActivationResult TryActivate(int row, int col, wxGrid* grid, const wxGridActivationSource& actSource) wxOVERRIDE;
     virtual void DoActivate(int row, int col, wxGrid* grid) wxOVERRIDE;