Duplicate print jobs were being sent when printing via cloud from abstract printers.

This was due to the connect function not being called on the CloudOutputDevice used to print on the cloud. This function is only called when it becomes an active printer (AbstractCloudOutputDevice is the active printer instead now).

The fix is to always listen for signals to reset the print job even when not the active printer.

I've chosen different signals now so there is not too much spam on the reset function.

The BackendStateDone signal catches new slices. The SceneChanged signal catches ufp files being loaded (These do not trigger BackendState changes)

CURA-9678

plugins/UM3NetworkPrinting/src/Cloud/CloudOutputDevice.py

@@ -10,7 +10,6 @@ from PyQt6.QtGui import QDesktopServices
 from PyQt6.QtNetwork import QNetworkReply, QNetworkRequest  # Parse errors specific to print job uploading.
 
 from UM import i18nCatalog
-from UM.Backend.Backend import BackendState
 from UM.FileHandler.FileHandler import FileHandler
 from UM.Logger import Logger
 from UM.Scene.SceneNode import SceneNode
@@ -18,6 +17,8 @@ from UM.Version import Version
 from cura.CuraApplication import CuraApplication
 from cura.PrinterOutput.NetworkedPrinterOutputDevice import AuthState
 from cura.PrinterOutput.PrinterOutputDevice import ConnectionType
+from cura.Scene.GCodeListDecorator import GCodeListDecorator
+from cura.Scene.SliceableObjectDecorator import SliceableObjectDecorator
 
 from .CloudApiClient import CloudApiClient
 from ..ExportFileJob import ExportFileJob
@@ -110,6 +111,9 @@ class CloudOutputDevice(UltimakerNetworkedPrinterOutputDevice):
         self._pre_upload_print_job = None  # type: Optional[CloudPrintJobResponse]
         self._uploaded_print_job = None  # type: Optional[CloudPrintJobResponse]
 
+        CuraApplication.getInstance().getBackend().backendDone.connect(self._resetPrintJob)
+        CuraApplication.getInstance().getController().getScene().sceneChanged.connect(self._onSceneChanged)
+
     def connect(self) -> None:
         """Connects this device."""
 
@@ -117,8 +121,6 @@ class CloudOutputDevice(UltimakerNetworkedPrinterOutputDevice):
             return
         Logger.log("i", "Attempting to connect to cluster %s", self.key)
         super().connect()
-
-        CuraApplication.getInstance().getBackend().backendStateChange.connect(self._onBackendStateChange)
         self._update()
 
     def disconnect(self) -> None:
@@ -128,11 +130,14 @@ class CloudOutputDevice(UltimakerNetworkedPrinterOutputDevice):
             return
         super().disconnect()
         Logger.log("i", "Disconnected from cluster %s", self.key)
-        CuraApplication.getInstance().getBackend().backendStateChange.disconnect(self._onBackendStateChange)
 
-    def _onBackendStateChange(self, _: BackendState) -> None:
+    def _onSceneChanged(self, node: SceneNode):
-        """Resets the print job that was uploaded to force a new upload, runs whenever the user re-slices."""
+        # This will reset the print job if a ufp file is loaded. This forces a new upload when printing via cloud from ufp.
+        if node.getDecorator(GCodeListDecorator) or node.getDecorator(SliceableObjectDecorator):
+            self._resetPrintJob()
 
+    def _resetPrintJob(self) -> None:
+        """Resets the print job that was uploaded to force a new upload, runs whenever slice finishes."""
         self._tool_path = None
         self._pre_upload_print_job = None
         self._uploaded_print_job = None