Lipu Fei 64ae8bb595 Use global stack to evaluate limit_to_extruder value
CURA-3738

Getting limit_to_extruder from definition in QML returns a
SettingFunction which hasn't been evaluated. This causes the comparison
not to be working. We change it to use the global stack to evaluate so
we can get an actual extruder number string.
2017-05-24 10:17:13 +02:00
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