fix: ensure uuid column is preserved for grid data

i.e. even if it's not explicitly requested; this is for sake of checkboxes

tests/grids/test_base.py

@@ -1993,7 +1993,7 @@ class TestGrid(WebTestCase):
             context, {"data": [{"foo": "bar", "baz": "zoo"}], "row_classes": {}}
         )
 
-        # non-declared columns are discarded
+        # non-declared columns are discarded...
         mydata = [
             {"foo": "a", "bar": "b", "baz": "c"},
         ]
@@ -2001,6 +2001,25 @@ class TestGrid(WebTestCase):
         context = grid.get_vue_context()
         self.assertEqual(context, {"data": [{"bar": "b"}], "row_classes": {}})
 
+        # ...but uuid column is never discarded
+        mydata = [
+            {
+                "foo": "a",
+                "bar": "b",
+                "baz": "c",
+                "uuid": "069bb511-39d3-7c74-8000-38668fdef9ec",
+            },
+        ]
+        grid = self.make_grid(columns=["bar"], data=mydata)
+        context = grid.get_vue_context()
+        self.assertEqual(
+            context,
+            {
+                "data": [{"bar": "b", "uuid": "069bb511-39d3-7c74-8000-38668fdef9ec"}],
+                "row_classes": {},
+            },
+        )
+
         # if grid has actions, that list may be supplemented
         mydata = [
             {"foo": "bar", "baz": "zoo"},