pierrejeambrun opened a new pull request, #70820:
URL: https://github.com/apache/airflow/pull/70820
Third of the deferred items from #70777.
v4 rewrites the public API: `PanelGroup` → `Group`, `PanelResizeHandle` →
`Separator`, `direction` → `orientation`, `autoSaveId` → the
`useDefaultLayout({ id })` hook, `ref` → `groupRef` (via `useGroupRef`),
`ImperativePanelGroupHandle` → `GroupImperativeHandle`. `onDragging` is gone
from `Separator` — the drag-end "refit graph zoom" behavior in `DetailsLayout`
and `AssetLayout` now runs from `Group`'s `onLayoutChanged`, branching on
`meta.isUserInteraction` so `PanelButtons`' programmatic `setLayout` doesn't
double-fit. `Panel`'s `order` prop is gone (source order is used). `setLayout`
now takes a `{ [panelId]: percentage }` map instead of an ordered array.
v4's `readLegacyLayout` transparently migrates the v3 `localStorage` entries
on first load, so users' remembered panel widths survive the upgrade.
`AssetLayout` panels get stable `id="asset-graph"` / `id="asset-details"`
because v4 keys persistence by panel id — without explicit ids,
`useId`-generated values change across reloads and layout wouldn't restore.
##### Was generative AI tooling used to co-author this PR?
- [X] Yes — Claude Code (Opus 4.7)
Generated-by: Claude Code (Opus 4.7) following [the
guidelines](https://github.com/apache/airflow/blob/main/contributing-docs/05_pull_requests.rst#gen-ai-assisted-contributions)
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