Fix of the SLA situation where an object was sliced even after being

moved out of the print bed.

Added an event.Skip() when processing OnActivate event.

src/slic3r/GUI/MainFrame.cpp

@@ -108,6 +108,7 @@ wxFrame(NULL, wxID_ANY, SLIC3R_BUILD, wxDefaultPosition, wxDefaultSize, wxDEFAUL
     Bind(wxEVT_ACTIVATE, [this](wxActivateEvent& event) {
         if (m_plater != nullptr && event.GetActive())
             m_plater->on_activate();
+        event.Skip();
     });
 
     wxGetApp().persist_window_geometry(this);