Supply label width and height to the label printing plugin

InvenTree/plugin/builtin/integration/mixins.py

@@ -419,6 +419,10 @@ class LabelPrintingMixin:
         Arguments:
             label: A black-and-white pillow Image object
 
+        kwargs:
+            length: The length of the label (in mm)
+            width: The width of the label (in mm)
+
         """
 
         # Unimplemented (to be implemented by the particular plugin class)

InvenTree/plugin/events.py

@@ -217,7 +217,7 @@ def print_label(plugin_slug, label_image, label_instance=None, user=None):
         return
 
     try:
-        plugin.print_label(label_image)
+        plugin.print_label(label_image, width=label_instance.width, height=label_instance.height)
     except Exception as e:
         # Plugin threw an error - notify the user who attempted to print