Keep dashboard category identity separate from shortened labels

tests/test_dashboard_regressions.py

@@ -1,7 +1,8 @@
 from typing import Any
 
+import pandas as pd
 import pytest
-
+from great_ai.deploy.routes.dashboard.create_dash_app import get_dimension_descriptor
 from great_ai.deploy.routes.dashboard.get_filter_from_datatable import (
     get_filter_from_datatable,
 )
@@ -30,3 +31,13 @@ def test_dashboard_filter_grammar(expression: str, operator: str, value: Any) ->
 )
 def test_incomplete_filters_are_ignored(expression: str) -> None:
     assert get_filter_from_datatable(expression) is None
+
+
+def test_long_category_labels_keep_distinct_coordinates() -> None:
+    prefix = "a" * 40
+    dimension = get_dimension_descriptor(
+        pd.DataFrame({"category": [prefix + "1", prefix + "2"]}), "category"
+    )
+    assert dimension["values"] == [0, 1]
+    assert dimension["tickvals"] == [0, 1]
+    assert dimension["ticktext"] == [prefix, prefix]