check_version.py: Add the MagnetHoleChamfer property for v0.11.9 migration.

MagnetHoleChamfer is needed for baseplates with magnet holes since v0.11.9.

Author: glenn20

freecad/gridfinity_workbench/check_version.py

@@ -27,6 +27,17 @@ def migrate_object_version(obj: fc.DocumentObject) -> None:  # noqa: C901
 
     ### v0.11.9 Changes ###
 
+    if (hasattr(obj, "Baseplate") and
+        hasattr(obj, "MagnetHoles") and
+        not hasattr(obj, "MagnetHoleChamfer")):
+        # Add property for the magnet hole chamfer.
+        obj.addProperty(
+            "App::PropertyLength",
+            "MagnetHoleChamfer",
+            "GridfinityNonStandard",
+            "The depth at which magnet hole chamfer starts.",
+        ).MagnetHoleChamfer = 0.25
+
     if hasattr(obj, "MagnetHoles"):
         # Add properties for the crush ribs to hold magnets.
         if not hasattr(obj, "CrushRibsCount"):