GCode.cpp: Fix of temperature change before print Function set_extruder can be called before moving to the first layer, m_layer_index is then -1. We definitely don't want to set temperature for second layer in that case.
GCode.cpp: Fix of temperature change before print
Function set_extruder can be called before moving to the first layer, m_layer_index is then -1. We definitely don't want to set temperature for second layer in that case.

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