Fix another crash for PyGObject < 3.50.0

Author: kamilburda

batcher/pygimplib/pypdb.py

@@ -450,8 +450,14 @@ def __call__(self, *args, **kwargs):
       # GIMP internally transforms GEGL enum values to `Gimp.Choice` values:
       #  https://gitlab.gnome.org/GNOME/gimp/-/merge_requests/2008
       if should_transform_enum_to_choice:
-        processed_value = (
-          type(self._properties[arg_name].default_value)(arg_value).value_nick)
+        # For PyGObject >= 3.50.0, `default_value` returns an int rather than
+        # an enum value. `get_default_value()` is not available in < 3.50.0.
+        if hasattr(self._properties[arg_name], 'get_default_value'):
+          enum_default_value = self._properties[arg_name].get_default_value()
+        else:
+          enum_default_value = self._properties[arg_name].default_value
+
+        processed_value = type(enum_default_value)(arg_value).value_nick
       else:
         processed_value = arg_value
 

batcher/pygimplib/setting/settings.py

@@ -1380,7 +1380,14 @@ def _process_enum_type(self, enum_type):
           procedure_param = enum_type[1]
 
       if procedure_param is not None:
-        processed_enum_type = type(procedure_param.default_value)
+        # For PyGObject >= 3.50.0, `default_value` returns an int rather than
+        # an enum value. `get_default_value()` is not available in < 3.50.0.
+        if hasattr(procedure_param, 'get_default_value'):
+          enum_default_value = procedure_param.get_default_value()
+        else:
+          enum_default_value = procedure_param.default_value
+
+        processed_enum_type = type(enum_default_value)
       else:
         raise TypeError(
           f'procedure "{enum_type[0]}" or its property "{enum_type[1]}"'