fix(popup): Dropdown popup width doesn't match input width when tags collapse in oneLine mode

[alexandrusoare]

SUMMARY

In horizontal filter bar (oneLine mode), when a multi-select filter has selected items, the dropdown popup width doesn't match the input width after it opens.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

BEFORE

Screen.Recording.2026-04-06.at.14.12.21.mov

AFTER

Screen.Recording.2026-04-06.at.14.10.44.mov

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • 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

[bito-code-review]

Code Review Agent Run #709e75

Actionable Suggestions - 0

Review Details

• Files reviewed - 2 · Commit Range: 97d2730..97d2730

  • superset-frontend/packages/superset-ui-core/src/components/Select/Select.test.tsx
  • superset-frontend/packages/superset-ui-core/src/components/Select/Select.tsx
• Files skipped - 0
• Tools

  • Whispers (Secret Scanner) - ✔︎ Successful
  • Detect-secrets (Secret Scanner) - ✔︎ Successful

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.56%. Comparing base (d796543) to head (e06b619).
⚠️ Report is 46 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #39136      +/-   ##
==========================================
+ Coverage   64.52%   64.56%   +0.03%     
==========================================
  Files        2536     2536              
  Lines      131208   131139      -69     
  Branches    30457    30450       -7     
==========================================
+ Hits        84661    84666       +5     
+ Misses      45084    45010      -74     
  Partials     1463     1463              

Flag	Coverage Δ
javascript	66.07% <100.00%> (+<0.01%)	⬆️

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[bito-code-review]

Code Review Agent Run #8a192b

Actionable Suggestions - 0

Review Details

• Files reviewed - 1 · Commit Range: 97d2730..e06b619

  • superset-frontend/packages/superset-ui-core/src/components/Select/Select.test.tsx
• Files skipped - 0
• Tools

  • Whispers (Secret Scanner) - ✔︎ Successful
  • Detect-secrets (Secret Scanner) - ✔︎ Successful

---

Bito Usage Guide

Commands

Type the following command in the pull request comment and save the comment.

• /review - Manually triggers a full AI review.

• /pause - Pauses automatic reviews on this pull request.

• /resume - Resumes automatic reviews.

• /resolve - Marks all Bito-posted review comments as resolved.

• /abort - Cancels all in-progress reviews.

Refer to the documentation for additional commands.

Configuration

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Documentation & Help

• Customize agent settings
• Review rules
• General documentation
• FAQ

AI Code Review powered by

[github-actions]

🎪 Showtime is building environment on GHA for e06b619

[github-actions]

🎪 Showtime deployed environment on GHA for e06b619

• Environment: http://34.221.17.37:8080 (admin/admin)
• Lifetime: 48h auto-cleanup
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[michaelmorera-preset]

The application is working as expected. Dropdown popup width matches the input width.

Evidence video to support QAgor comment (in the shortcut task):