sadpandajoe opened a new pull request, #43146:
URL: https://github.com/apache/superset/pull/43146

   ### SUMMARY
   On a chart's Explore control panel (Table chart and others sharing the
   `timeComparisonControls` section), selecting **Custom date** for **Time 
shift**
   and then clicking the `x` on **Shift start date** to clear it correctly 
raises
   a "date required" validation error. However, switching **Time shift** to a
   different preset afterward (e.g. *1 week ago*) did not clear that error — it
   stayed stuck, blocking further chart updates until a full page refresh.
   
   The `start_date_offset` control's `mapStateToProps` derives its validation
   error from a sibling control's value (`time_compare`), but the control config
   never declared `validationDependencies: ['time_compare']`. The Explore
   reducer's `SET_FIELD_VALUE` handler only re-runs a control's 
`mapStateToProps`
   for the control that changed or for controls that declare it as a
   `validationDependencies` entry, so `start_date_offset` was never re-validated
   when `time_compare` changed.
   
   This adds the missing `validationDependencies: ['time_compare']` declaration,
   mirroring the existing `validationDependencies: ['server_pagination']`
   pattern already used for a different control in the Table chart's control
   panel.
   
   ### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
   Before: Time shift = Custom date → clear Shift start date (error appears,
   correctly) → change Time shift to a preset (e.g. "1 week ago") → error
   persists and the chart cannot be updated until the page is refreshed.
   
   After: same steps → the error clears as soon as Time shift changes away from
   "Custom date", and the chart can be updated immediately.
   
   (Evidence to follow as a PR update.)
   
   ### TESTING INSTRUCTIONS
   1. Create or open a Table chart in Explore.
   2. Expand **Time Comparison**, set **Time shift** to **Custom date**.
   3. Click the `x` on **Shift start date** to clear it — a "date required" 
error
      appears (expected).
   4. Change **Time shift** to any other preset (e.g. "1 week ago").
   5. Confirm the error clears immediately and the chart can be updated without 
a
      page refresh.
   
   A reducer-level regression test covering this exact clear-then-switch 
sequence
   was added at `superset-frontend/src/explore/reducers/exploreReducer.test.ts`.
   
   ### 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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