[Hotfix 25.9]: [FXC-6883] fix(): trim boundary lookup names during split matching (#1966)

Co-authored-by: Ben <106089368+benflexcompute@users.noreply.github.com>

Author: github-actions[bot]

flow360/component/simulation/framework/boundary_split.py

@@ -375,7 +375,15 @@ def _add_zone_boundary_matches(self, volume_mesh_meta_data: dict) -> None:
 
     def get_split_info(self, base_name: str) -> List[BoundarySplitInfo]:
         """Get all split info for a base boundary name."""
-        return self._mapping.get(base_name, [])
+        split_infos = self._mapping.get(base_name, [])
+        if split_infos:
+            return split_infos
+
+        normalized_name = base_name.strip()
+        if normalized_name != base_name:
+            return self._mapping.get(normalized_name, [])
+
+        return []
 
 
 # --- Entity update functions (external entry point) ---

tests/simulation/framework/test_boundary_split.py

@@ -125,6 +125,35 @@ def test_single_zone_lookup(self, single_zone_mesh_metadata):
         assert len(split_infos) == 1
         assert split_infos[0].full_name == "fluid/wing"
 
+    def test_lookup_trims_leading_and_trailing_whitespace(self, single_zone_mesh_metadata):
+        """Test that leading/trailing whitespace is ignored during lookup."""
+        lookup_table = BoundaryNameLookupTable(single_zone_mesh_metadata)
+
+        for candidate in (" wing", "wing ", " wing ", " fluid/wing ", "\twing\n"):
+            split_infos = lookup_table.get_split_info(candidate)
+            assert len(split_infos) == 1
+            assert split_infos[0].full_name == "fluid/wing"
+
+    def test_lookup_does_not_normalize_internal_whitespace(self):
+        """Test that internal whitespace differences do not match."""
+        mesh_metadata = {
+            "zones": {
+                "fluid": {
+                    "boundaryNames": [
+                        "fluid/panel left",
+                    ],
+                },
+            }
+        }
+        lookup_table = BoundaryNameLookupTable(mesh_metadata)
+
+        split_infos = lookup_table.get_split_info("panel left")
+        assert len(split_infos) == 1
+        assert split_infos[0].full_name == "fluid/panel left"
+
+        assert lookup_table.get_split_info("panel  left") == []
+        assert lookup_table.get_split_info("fluid/panel  left") == []
+
     def test_empty_metadata(self):
         """Test with empty metadata."""
         lookup_table = BoundaryNameLookupTable({})