manish1337 opened a new pull request, #73572:
URL: https://github.com/apache/airflow/pull/73572
When the grid is scrolled horizontally, the run where the Dag version
changes can slide under the sticky task name column. The bar is hidden
correctly, but its vertical version line kept painting on top of the column and
over the duration labels, so it appeared to mark a version change at a
different run. The horizontal version markers in the task rows had the same
problem over the task names.
The version indicators and the sticky column both use `zIndex={1}`, and the
run containers did not form their own stacking context, so the indicators
(later in DOM order) won. Both run containers (the duration-bar row and the
task-instance columns) now use `isolation: isolate`, matching the existing
pattern in `GanttTimeline.tsx`. The outer header container is deliberately left
alone, because the "older runs" pagination button intentionally overlaps the
task name column.
**Before**
https://github.com/user-attachments/assets/f5e22cab-0a1c-4c97-8f1d-5f6b093d6b88
**After**
https://github.com/user-attachments/assets/27ea45b3-023e-4b04-934f-1d21e953c560
**Testing**
- Added `Grid.test.tsx`, a regression test that fails without the change and
passes with it.
- Full UI suite passes locally on Node 24 (151 files, 1314 tests); `prek`
pre-commit and manual stages pass.
- Verified in a browser against a 3.3.2 standalone instance: built the 3.3.2
UI with and without this change, scrolled the `v2` run under the task name
column, and checked which element paints on top at the indicator's position
(the indicator before, the column text after).
---
##### Was generative AI tooling used to co-author this PR?
- [X] Yes — Claude Code (Opus 5.5)
Generated-by: Claude Code (Opus 5.5) following [the
guidelines](https://github.com/apache/airflow/blob/main/contributing-docs/05_pull_requests.rst#gen-ai-assisted-contributions)
---
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