Ensure that the intent model gets populated

CURA-6534

cura/Machines/Models/IntentModel.py

@@ -6,12 +6,31 @@ from PyQt5.QtCore.QObject import QObject
 from UM.Qt.ListModel import ListModel
 from PyQt5.QtCore import Qt
 
+from UM.Settings.ContainerRegistry import ContainerRegistry
+
 
 class IntentModel(ListModel):
+    NameRole = Qt.UserRole + 1
+    IdRole = Qt.UserRole + 2
+
     def __init__(self, parent: Optional[QObject] = None) -> None:
         super().__init__(parent)
 
+        self.addRoleName(self.NameRole, "name")
+        self.addRoleName(self.IdRole, "id")
+
+        ContainerRegistry.getInstance().containerAdded.connect(self._onChanged)
+        ContainerRegistry.getInstance().containerRemoved.connect(self._onChanged)
+
         self._update()
 
+    def _onChanged(self, container):
+        if container.getMetaDataEntry("type") == "intent":
+            self._update()
+
     def _update(self) -> None:
-        pass
+        new_items = []
+        for container in ContainerRegistry.getInstance().findInstanceContainers(type="intent"):
+            new_items.append({"name": container.getName(), "id": container.getId()})
+
+        self.setItems(new_items)