sadpandajoe opened a new pull request, #42146:
URL: https://github.com/apache/superset/pull/42146

   ### SUMMARY
   
   The Ant Design v5 → v6 upgrade (#41636) renamed many of antd's generated 
internal
   `.ant-*` DOM classes. Superset styles a number of those internals directly — 
via
   styled-components, `css` template literals, `*.styles.ts`, and runtime DOM 
lookups
   (`getPopupContainer`, `.closest()`, `querySelector`) — so when a class was 
renamed
   the override silently stopped matching. Nothing throws; the styling just 
quietly
   breaks, producing a range of visual regressions (mis-sized modals, broken 
progress
   bars, alert layout, spinner sizing, step connectors, popups escaping their 
modal,
   etc.).
   
   This PR sweeps the frontend for every stale `.ant-*` reference left behind 
by the
   v6 rename and updates them to the v6 class names. The specific renames fixed:
   
   | v5 class | v6 class | Affected areas |
   |---|---|---|
   | `.ant-modal-content` | `.ant-modal-container` | Modal wrapper styling; 
Select/popup `getPopupContainer`/`.closest()` anchoring so menus stay clipped 
inside modals |
   | `.ant-progress-inner` | `.ant-progress-rail` | ProgressBar; DatabaseModal 
upload progress |
   | `.ant-progress-bg` | `.ant-progress-track` | ProgressBar striped gradient |
   | `.ant-alert-message` | `.ant-alert-title` | ImportModal, DatabaseModal 
warning alert |
   | `.ant-alert-action` | `.ant-alert-actions` | SQL Lab editor, native-filter 
modal footers |
   | `.ant-spin-nested-loading .ant-spin .ant-spin-dot` | `.ant-spin 
.ant-spin-dot` | Table / VirtualTable spinner sizing (wrapper element dropped 
in v6) |
   | `.ant-steps-item-tail` | `.ant-steps-item-rail` | ChartCreation step 
connector line |
   | `.ant-steps-item-description` (removed) | text now in 
`.ant-steps-item-content` | ChartCreation step description styling |
   
   To keep future antd bumps from re-introducing silent breakage, this PR also 
extends
   `antdDomContract.test.tsx` — a set of tests that render antd directly and 
assert the
   exact internal class names our CSS depends on. If a future antd upgrade 
renames one
   of these classes again, the contract test fails loudly with a clear pointer 
instead
   of shipping a visual regression.
   
   ### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
   
   _N/A — these are internal DOM-class selector fixes. The "after" is the 
restored v5
   appearance across the affected surfaces (modals, progress bars, alerts, 
spinners,
   step wizards)._
   
   ### TESTING INSTRUCTIONS
   
   - `cd superset-frontend && npm run test -- antdDomContract` — the DOM-class 
contract
     suite passes (it pins every class touched here against a real antd v6 
render).
   - Manual spot checks against the affected surfaces:
     - Open any modal (e.g. Datasource editor, native-filter config) — content 
fills the
       modal correctly and Select dropdowns inside it stay clipped within the 
modal.
     - Database connection modal — upload progress bar and warning alert render 
correctly.
     - SQL Lab — the alert action buttons in the editor sit in the alert's 
action slot.
     - Chart creation wizard — step connector line is hidden and step 
descriptions are
       spaced correctly.
     - Any table with a loading spinner (e.g. VirtualTable) — spinner is sized 
correctly.
   
   ### ADDITIONAL INFORMATION
   
   - [ ] Has associated issue:
   - [ ] Required feature flags:
   - [x] Changes UI
   - [ ] Includes DB Migration (follow approval process in 
[SIP-59](https://github.com/apache/superset/issues/13351))
     - [ ] Migration is atomic, supports rollback & is backwards-compatible
     - [ ] Confirm DB migration upgrade and downgrade tested
     - [ ] Runtime estimates and downtime expectations provided
   - [ ] Introduces new feature or API
   - [ ] Removes existing feature or API
   


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