FIX:(mac)preview display

preview GCodeViewer Legend display doesn't disable when changing printer setting

Change-Id: I97a1b9a1002a6327c31721f9b695a2fe2fe0dbf6

src/slic3r/GUI/GUI_ObjectList.cpp

@@ -92,6 +92,9 @@ ObjectList::ObjectList(wxWindow* parent) :
     Bind(wxEVT_DATAVIEW_SELECTION_CHANGED, [this](wxDataViewEvent& event) {
         // detect the current mouse position here, to pass it to list_manipulation() method
         // if we detect it later, the user may have moved the mouse pointer while calculations are performed, and this would mess-up the HitTest() call performed into list_manipulation()
+        if (!GetScreenRect().Contains(wxGetMousePosition())) {
+            return;
+        }
 #ifndef __WXOSX__
         const wxPoint mouse_pos = this->get_mouse_position_in_control();
 #endif