Move ExtrudersModel into cura.UI module

cura/CuraApplication.py

@@ -102,7 +102,7 @@ from cura.TaskManagement.OnExitCallbackManager import OnExitCallbackManager
 from cura.Settings.MachineManager import MachineManager
 from cura.Settings.ExtruderManager import ExtruderManager
 from cura.Settings.UserChangesModel import UserChangesModel
-from cura.Settings.ExtrudersModel import ExtrudersModel
+from cura.UI.ExtrudersModel import ExtrudersModel
 from cura.Settings.MaterialSettingsVisibilityHandler import MaterialSettingsVisibilityHandler
 from cura.Settings.ContainerManager import ContainerManager
 from cura.Settings.SidebarCustomMenuItemsModel import SidebarCustomMenuItemsModel

cura/UI/ExtrudersModel.py

@@ -2,23 +2,25 @@
 # Cura is released under the terms of the LGPLv3 or higher.
 
 from PyQt5.QtCore import Qt, pyqtSignal, pyqtProperty, QTimer
-from typing import Iterable
+from typing import Iterable, TYPE_CHECKING
 
 from UM.i18n import i18nCatalog
-import UM.Qt.ListModel
+from UM.Qt.ListModel import ListModel
 from UM.Application import Application
 import UM.FlameProfiler
 
-from cura.Settings.ExtruderStack import ExtruderStack  # To listen to changes on the extruders.
+if TYPE_CHECKING:
+    from cura.Settings.ExtruderStack import ExtruderStack  # To listen to changes on the extruders.
 
 catalog = i18nCatalog("cura")
 
+
 ##  Model that holds extruders.
 #
 #   This model is designed for use by any list of extruders, but specifically
 #   intended for drop-down lists of the current machine's extruders in place of
 #   settings.
-class ExtrudersModel(UM.Qt.ListModel.ListModel):
+class ExtrudersModel(ListModel):
     # The ID of the container stack for the extruder.
     IdRole = Qt.UserRole + 1
 

plugins/CuraEngineBackend/ProcessSlicedLayersJob.py

@@ -24,7 +24,7 @@ from cura import LayerPolygon
 
 import numpy
 from time import time
-from cura.Settings.ExtrudersModel import ExtrudersModel
+from cura.UI.ExtrudersModel import ExtrudersModel
 catalog = i18nCatalog("cura")