Store the printer cluster size as a metadata entry on the machine

This makes the cluster size also available when the machine is offline.
Also fixes an issue where the cluster size is improperly restored
once the internet connection comes back online, resulting in the printer
showing as a single printer until next sync

CURA-7347

cura/Settings/MachineManager.py

@@ -488,7 +488,11 @@ class MachineManager(QObject):
 
     @pyqtProperty(bool, notify = printerConnectedStatusChanged)
     def activeMachineIsGroup(self) -> bool:
-        return bool(self._printer_output_devices) and len(self._printer_output_devices[0].printers) > 1
+        if self.activeMachine is None:
+            return False
+
+        group_size = int(self.activeMachine.getMetaDataEntry("group_size", "-1"))
+        return group_size > 1
 
     @pyqtProperty(bool, notify = printerConnectedStatusChanged)
     def activeMachineHasNetworkConnection(self) -> bool:

plugins/UM3NetworkPrinting/src/Cloud/CloudOutputDevice.py

@@ -74,7 +74,7 @@ class CloudOutputDevice(UltimakerNetworkedPrinterOutputDevice):
             b"name": cluster.friendly_name.encode() if cluster.friendly_name else b"",
             b"firmware_version": cluster.host_version.encode() if cluster.host_version else b"",
             b"printer_type": cluster.printer_type.encode() if cluster.printer_type else b"",
-            b"cluster_size": b"1"  # cloud devices are always clusters of at least one
+            b"cluster_size": str(cluster.printer_count).encode() if cluster.printer_count else b"1"
         }
 
         super().__init__(

plugins/UM3NetworkPrinting/src/Cloud/CloudOutputDeviceManager.py

@@ -265,6 +265,7 @@ class CloudOutputDeviceManager:
         machine.setName(device.name)
         machine.setMetaDataEntry(self.META_CLUSTER_ID, device.key)
         machine.setMetaDataEntry("group_name", device.name)
+        machine.setMetaDataEntry("group_size", device.clusterSize)
         machine.setMetaDataEntry("removal_warning", self.I18N_CATALOG.i18nc(
             "@label ({} is printer name)",
             "{} will be removed until the next account sync. <br> To remove {} permanently, "

plugins/UM3NetworkPrinting/src/Models/Http/CloudClusterResponse.py

@@ -11,7 +11,7 @@ class CloudClusterResponse(BaseModel):
 
     def __init__(self, cluster_id: str, host_guid: str, host_name: str, is_online: bool, status: str,
                  host_internal_ip: Optional[str] = None, host_version: Optional[str] = None,
-                 friendly_name: Optional[str] = None, printer_type: str = "ultimaker3", **kwargs) -> None:
+                 friendly_name: Optional[str] = None, printer_type: str = "ultimaker3", printer_count: int = 1, **kwargs) -> None:
         """Creates a new cluster response object.
 
         :param cluster_id: The secret unique ID, e.g. 'kBEeZWEifXbrXviO8mRYLx45P8k5lHVGs43XKvRniPg='.
@@ -23,6 +23,7 @@ class CloudClusterResponse(BaseModel):
         :param host_internal_ip: The internal IP address of the host printer.
         :param friendly_name: The human readable name of the host printer.
         :param printer_type: The machine type of the host printer.
+        :param printer_count: The amount of printers in the print cluster. 1 for a single printer
         """
 
         self.cluster_id = cluster_id
@@ -34,6 +35,7 @@ class CloudClusterResponse(BaseModel):
         self.host_internal_ip = host_internal_ip
         self.friendly_name = friendly_name
         self.printer_type = printer_type
+        self.printer_count = printer_count
         super().__init__(**kwargs)
 
     # Validates the model, raising an exception if the model is invalid.