Add version upgrade for Cura 4.12

Yep, there's gonna be a 4.12.

Contributes to issue CURA-8510.

plugins/VersionUpgrade/VersionUpgrade411to412/VersionUpgrade411to412.py

@@ -0,0 +1,94 @@
+# Copyright (c) 2021 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+import configparser
+import io
+from typing import List, Tuple
+
+from UM.VersionUpgrade import VersionUpgrade
+
+
+class VersionUpgrade411to412(VersionUpgrade):
+    """
+    Upgrades configurations from the state they were in at version 4.11 to the
+    state they should be in at version 4.12.
+    """
+
+    _flsun_profile_mapping = {
+        "extra_coarse": "flsun_sr_normal",
+        "coarse": "flsun_sr_normal",
+        "extra_fast": "flsun_sr_normal",
+        "draft": "flsun_sr_normal",
+        "fast": "flsun_sr_normal",
+        "normal": "flsun_sr_normal",
+        "high": "flsun_sr_fine"
+    }
+
+    def upgradePreferences(self, serialized: str, filename: str) -> Tuple[List[str], List[str]]:
+        """
+        Upgrades preferences to have the new version number.
+        :param serialized: The original contents of the preferences file.
+        :param filename: The file name of the preferences file.
+        :return: A list of new file names, and a list of the new contents for
+        those files.
+        """
+        parser = configparser.ConfigParser(interpolation = None)
+        parser.read_string(serialized)
+
+        # Update version number.
+        parser["metadata"]["setting_version"] = "18"
+
+        result = io.StringIO()
+        parser.write(result)
+        return [filename], [result.getvalue()]
+
+
+    def upgradeInstanceContainer(self, serialized: str, filename: str) -> Tuple[List[str], List[str]]:
+        """
+        Upgrades instance containers to have the new version number.
+        :param serialized: The original contents of the instance container.
+        :param filename: The file name of the instance container.
+        :return: A list of file names, and a list of the new contents for those
+        files.
+        """
+        parser = configparser.ConfigParser(interpolation = None, comment_prefixes = ())
+        parser.read_string(serialized)
+
+        # Update setting version number.
+        if "metadata" not in parser:
+            parser["metadata"] = {}
+        parser["metadata"]["setting_version"] = "18"
+
+        result = io.StringIO()
+        parser.write(result)
+        return [filename], [result.getvalue()]
+
+    def upgradeStack(self, serialized: str, filename: str) -> Tuple[List[str], List[str]]:
+        """
+        Upgrades container stacks to have the new version number.
+        Upgrades container stacks for FLSun Racer to change their profiles.
+        :param serialized: The original contents of the container stack.
+        :param filename: The file name of the container stack.
+        :return: A list of file names, and a list of the new contents for those
+        files.
+        """
+        parser = configparser.ConfigParser(interpolation = None)
+        parser.read_string(serialized)
+
+        # Update setting version number.
+        if "metadata" not in parser:
+            parser["metadata"] = {}
+        parser["metadata"]["setting_version"] = "18"
+
+        # Change renamed profiles.
+        if "containers" in parser:
+            definition_id = parser["containers"].get("7")
+            if definition_id == "flsun_sr":
+                if parser["metadata"].get("type", "machine") == "machine":  # Only global stacks.
+                    old_quality = parser["containers"].get("3")
+                    new_quality = self._flsun_profile_mapping.get(old_quality, "flsun_sr_normal")
+                    parser["containers"]["3"] = new_quality
+
+        result = io.StringIO()
+        parser.write(result)
+        return [filename], [result.getvalue()]