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CURA-4107 In old Cura, there is no definitionChanges container, so loading a project file from an old version will result in stacks with empty defnitionChanges. This will cause an unnecessary auto-slice problem when we switch between the extruder tabs for the first time. This action will trigger a piece code in MachineAction which creates a definitionChanges container for the active stack if it is empty. This eventually triggers a propertyChanged signal and results in an unncessary auto-slicing.