Add version upgrade to halve the maximum deviation once again

As explained in the comment. We reverted a change in 4.6, so we must unrevert it in master again.

Contributes to issue CURA-7420.

plugins/VersionUpgrade/VersionUpgrade462to47/VersionUpgrade462to47.py

@@ -0,0 +1,83 @@
+# Copyright (c) 2020 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+import configparser
+from typing import Tuple, List
+import io
+from UM.VersionUpgrade import VersionUpgrade
+
+class VersionUpgrade462to47(VersionUpgrade):
+    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"] = "15"
+
+        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.
+
+        This changes the maximum deviation setting if that setting was present
+        in the profile.
+        :param serialized: The original contents of the instance container.
+        :param filename: The original file name of the instance container.
+        :return: A list of new file names, and a list of the new contents for
+        those files.
+        """
+        parser = configparser.ConfigParser(interpolation = None, comment_prefixes = ())
+        parser.read_string(serialized)
+
+        # Update version number.
+        parser["metadata"]["setting_version"] = "15"
+
+        if "values" in parser:
+            # Maximum Deviation's effect was corrected. Previously the deviation
+            # ended up being only half of what the user had entered. This was
+            # fixed in Cura 4.7 so there we need to halve the deviation that the
+            # user had entered.
+            #
+            # This got accidentally merged in Cura 4.6.0. In 4.6.2 we removed
+            # that. In 4.7 it's not unmerged, so there we need to revert all
+            # that again.
+            if "meshfix_maximum_deviation" in parser["values"]:
+                maximum_deviation = parser["values"]["meshfix_maximum_deviation"]
+                if maximum_deviation.startswith("="):
+                    maximum_deviation = maximum_deviation[1:]
+                maximum_deviation = "=(" + maximum_deviation + ") / 2"
+                parser["values"]["meshfix_maximum_deviation"] = maximum_deviation
+
+        result = io.StringIO()
+        parser.write(result)
+        return [filename], [result.getvalue()]
+
+    def upgradeStack(self, serialized: str, filename: str) -> Tuple[List[str], List[str]]:
+        """
+        Upgrades stacks to have the new version number.
+        :param serialized: The original contents of the stack.
+        :param filename: The original file name of the stack.
+        :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.
+        if "metadata" not in parser:
+            parser["metadata"] = {}
+        parser["metadata"]["setting_version"] = "15"
+
+        result = io.StringIO()
+        parser.write(result)
+        return [filename], [result.getvalue()]

plugins/VersionUpgrade/VersionUpgrade462to47/__init__.py

@@ -0,0 +1,59 @@
+# Copyright (c) 2020 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+from typing import Any, Dict, TYPE_CHECKING
+
+from . import VersionUpgrade462to47
+
+if TYPE_CHECKING:
+    from UM.Application import Application
+
+upgrade = VersionUpgrade462to47.VersionUpgrade462to47()
+
+def getMetaData() -> Dict[str, Any]:
+    return {
+        "version_upgrade": {
+            # From                           To                              Upgrade function
+            ("preferences", 6000014):        ("preferences", 6000015,        upgrade.upgradePreferences),
+            ("machine_stack", 4000014):      ("machine_stack", 4000015,      upgrade.upgradeStack),
+            ("extruder_train", 4000014):     ("extruder_train", 4000015,     upgrade.upgradeStack),
+            ("definition_changes", 4000014): ("definition_changes", 4000015, upgrade.upgradeInstanceContainer),
+            ("quality_changes", 4000014):    ("quality_changes", 4000015,    upgrade.upgradeInstanceContainer),
+            ("quality", 4000014):            ("quality", 4000015,            upgrade.upgradeInstanceContainer),
+            ("user", 4000014):               ("user", 4000015,               upgrade.upgradeInstanceContainer),
+        },
+        "sources": {
+            "preferences": {
+                "get_version": upgrade.getCfgVersion,
+                "location": {"."}
+            },
+            "machine_stack": {
+                "get_version": upgrade.getCfgVersion,
+                "location": {"./machine_instances"}
+            },
+            "extruder_train": {
+                "get_version": upgrade.getCfgVersion,
+                "location": {"./extruders"}
+            },
+            "definition_changes": {
+                "get_version": upgrade.getCfgVersion,
+                "location": {"./definition_changes"}
+            },
+            "quality_changes": {
+                "get_version": upgrade.getCfgVersion,
+                "location": {"./quality_changes"}
+            },
+            "quality": {
+                "get_version": upgrade.getCfgVersion,
+                "location": {"./quality"}
+            },
+            "user": {
+                "get_version": upgrade.getCfgVersion,
+                "location": {"./user"}
+            }
+        }
+    }
+
+
+def register(app: "Application") -> Dict[str, Any]:
+    return {"version_upgrade": upgrade}

plugins/VersionUpgrade/VersionUpgrade462to47/plugin.json

@@ -0,0 +1,8 @@
+{
+    "name": "Version Upgrade 4.6.2 to 4.7",
+    "author": "Ultimaker B.V.",
+    "version": "1.0.0",
+    "description": "Upgrades configurations from Cura 4.6.2 to Cura 4.7.",
+    "api": "7.2.0",
+    "i18n-catalog": "cura"
+}