[FIX] base_name_search_improved: don't patch abstract models

When applying monkey patches, we want to skip abstract models because patching
those may mess up the inheritance. An example of this is ir.model which is
assigned the studio mixin using inherit = ['studio.mixin', 'ir.model'].
If the mixin itself is patched, and the method is overridden once again (in,
say, enterprise 15's documents_spreadsheet), the super() method called in that
override is the patched version of studio.mixin rather than the override of
ir.model in the base module, which is now skipped entirely.

base_name_search_improved/models/ir_model.py

@@ -237,12 +237,25 @@ class IrModel(models.Model):
                 raise ValidationError(_("Name Search Domain must be a list of tuples"))
 
     def _register_hook(self):
+        """Apply monkey patches.
 
+        Patch `fields_view_get` on the base model, and a freshly generated copy
+        of `_name_search` on each concrete model.
+
+        We want to skip abstract models because patching those may mess up the
+        inheritance. An example of this is `ir.model` which is assigned the
+        studio mixin using `inherit = ['studio.mixin', 'ir.model']`.
+        If the mixin itself is patched, and the method is overridden once again
+        (in, say, enterprise's `documents_spreadsheet`), the super() method
+        called in that override is the patched version of `studio.mixin` rather
+        than the override of `ir.model` in the base module, which is now skipped
+        entirely.
+        """
         _logger.info("Patching BaseModel for Smart Search")
 
         for model in self.sudo().search(self.ids or []):
             Model = self.env.get(model.model)
-            if Model is not None:
+            if Model is not None and not Model._abstract:
                 Model._patch_method("_name_search", patch_name_search())
 
         return super()._register_hook()