joaopamaral opened a new pull request, #72478:
URL: https://github.com/apache/airflow/pull/72478
<!-- SPDX-License-Identifier: Apache-2.0
https://www.apache.org/licenses/LICENSE-2.0 -->
Setting `[api] grid_view_sorting_order = hierarchical_alphabetical` breaks
the Grid view on Airflow 3. `get_task_group_children_getter()`
(`api_fastapi/core_api/services/ui/task_group.py`) resolves that value to
`hierarchical_alphabetical_sort()` and calls it on the scheduler-side
`SerializedTaskGroup`, but only the task-sdk `TaskGroup` implements the method,
so every `/ui/structure/structure_data` and grid request fails with:
```
AttributeError: 'SerializedTaskGroup' object has no attribute
'hierarchical_alphabetical_sort'
```
This PR adds `hierarchical_alphabetical_sort()` to `SerializedTaskGroup`,
mirroring the task-sdk implementation (groups first, then tasks, each sorted
alphabetically by `node_id`), plus a unit test covering nested groups.
Supersedes #61877 (closed as stale); same fix rebased onto the current
`SerializedTaskGroup` layout. Before/after screenshots of the Grid view are in
that PR.
* related: #61877
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