Make 3MF-reader aware of setting-version for introduction Intent.

cura/Settings/CuraContainerStack.py

@@ -1,7 +1,7 @@
 # Copyright (c) 2018 Ultimaker B.V.
 # Cura is released under the terms of the LGPLv3 or higher.
 
-from typing import Any, cast, List, Optional
+from typing import Any, cast, Dict, List, Optional
 from PyQt5.QtCore import pyqtProperty, pyqtSignal, QObject
 
 from UM.Application import Application
@@ -364,3 +364,22 @@ class _ContainerIndexes:
 
     # Reverse lookup: type -> index
     TypeIndexMap = dict([(v, k) for k, v in IndexTypeMap.items()])
+
+    # Mapping to old values before Intent introduction. Used for reading older versions of input files.
+    IndexToOldIndexMap = {
+        UserChanges: 0,
+        QualityChanges: 1,
+        Intent: -1,  # Wasn't there in the old 'format'!
+        Quality: 2,
+        Material: 3,
+        Variant: 4,
+        DefinitionChanges: 5,
+        Definition: 6,
+    }
+
+    # Reverse lookup: old index -> new index
+    OldIndexToIndexMap = dict([(v, k) for k, v in IndexToOldIndexMap.items()])
+
+    @classmethod
+    def getIndexMapping(cls, setting_version: int) -> Dict[int, int]:
+        return dict([(x, x) for x in list(range(99))]) if setting_version >= 10 else cls.IndexToOldIndexMap