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0238f65e6a
When switching printers, it would first emit the global container changed signal which connects to _onGlobalContainerChanged, then update stuff in the extruder manager, then manually call _onGlobalContainerChanged again to update some other stuff with the new data from the extruder manager. This was prohibitively expensive, so this prevents that. Another double or triple emit of the activeExtruderChanged was removed in the extruder manager when creating the extruders for a printer: It would first set the extruder number to 0, possibly emitting the signal, then emit the signal just to be sure since the extruder itself changed (rather than just the number), and then change the extruder number to the preferred extruder, possibly again emitting a signal. Now it just sets the extruder number to the preferred extruder and always emits the signal once (either through setting the extruder number or manually afterwards). Contributes to issue CURA-6793.