kasiazjc opened a new pull request, #40023:
URL: https://github.com/apache/superset/pull/40023
### SUMMARY
The Superset global `Tabs` styled component overrides antd's default
`margin-bottom` on `.ant-tabs-nav` to `0`, which removed all visual separation
between the tab bar and the form content inside explore control popovers
(metric editor, column selector, filter editor). This also caused the spacing
between form items inside those popovers to fall back to antd's default
`FormItem` margin-bottom of 24px — far too large for a compact popover panel.
**Changes:**
- **`ExplorePopoverContent`** – adds `&& .ant-tabs-nav { margin-bottom: 12px
}` and `&& .ant-form-item { margin-bottom: 8px }` using the doubled `&&` class
to win the CSS specificity race against the per-instance Tabs CSS (which
injects at component render time, after global styles). Only affects Tabs
inside explore popover content, not Tabs elsewhere in the app.
- **`FilterPopoverContentContainer`** – removes two dead CSS selectors that
referenced Bootstrap class names (`.nav-tabs`,
`.adhoc-filter-simple-column-dropdown`) which never matched any elements after
the antd migration.
- **`FilterActionsContainer` / `LayerSelectContainer`** – replaces
`sizeUnit` arithmetic with the named antd spacing tokens (`marginXS`,
`marginXXL`, `marginMD`).
- **`AdhocFilterEditPopoverSimpleTabContent`** – removes the redundant
`marginTop` from the subject (column) Select — the tab bar's own bottom margin
now provides the leading gap — and reduces `marginTop`/`marginBottom` on filter
selects from `sizeUnit * 4` (legacy) to `marginXS` (8px) for consistency.
**Spacing result (all explore control popovers):**
| Gap | Value | Token |
|-----|-------|-------|
| Tab bar → first item | 12px | `marginSM` |
| Between form items | 8px | `marginXS` |
| Between filter selects | 8px | `marginXS` |
### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
_Before_: The tab bar was flush against the form content (0px gap).
FormItems had 24px separation.
_After_: 12px below the tab bar, 8px between form items — consistent with
compact antd panel conventions.
### TESTING INSTRUCTIONS
1. Open the explore view for any chart
2. Click on a **metric** to open the metric editor popover (Saved / Simple /
Custom SQL tabs)
3. Click on a **column** to open the column selector popover
4. Click on a **filter** to open the filter editor popover
5. Verify there is 12px of breathing room between the tab bar and the first
form control
6. Verify spacing between stacked form controls is 8px (column → aggregate
in metric editor; subject → operator → comparator in filter editor)
### 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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