Merge branch '4.11' of github.com:Ultimaker/Cura

plugins/CuraEngineBackend/CuraEngineBackend.py

@@ -159,7 +159,8 @@ class CuraEngineBackend(QObject, Backend):
 
         self._slicing_error_message = Message(
             text = catalog.i18nc("@message", "Slicing failed with an unexpected error. Please consider reporting a bug on our issue tracker."),
-            title = catalog.i18nc("@message:title", "Slicing failed")
+            title = catalog.i18nc("@message:title", "Slicing failed"),
+            message_type = Message.MessageType.ERROR
         )
         self._slicing_error_message.addAction(
             action_id = "report_bug",