Windows: add tabPanelDeferChanges feature

[seldoff]

Asana Task/Github Issue:
https://app.asana.com/1/137249556945/task/1212423226055822

Description

Windows: add tabPanelDeferChanges feature. This feature changes how the tab panel schedules its UI changes.

Feature change process:

• I have added a schema to validate this feature change.
• I have tested this change locally in all supported browsers.
• This code for the config change is ready to merge.
• This feature was covered by a tech design.

Site breakage mitigation process:

Brief explanation

• Reported URL:
• Problems experienced:
• Platforms affected:
  • iOS
  • Android
  • Windows
  • MacOS
  • Extensions
• Tracker(s) being unblocked:
• Feature being disabled/modified:
• This change is a speculative mitigation to fix reported breakage.

---

Note

Introduces an enabled feature flag to adjust tab panel UI scheduling.

• Adds tabPanelDeferChanges (state: enabled) to overrides/windows-override.json to defer tab panel UI updates

^{Written by Cursor Bugbot for commit dd3419b. This will update automatically on new commits. Configure here.}

[github-actions]

🔗 Preview Config for PR #4284

• extension-edg-config.json
• android-config.json
• extension-chrome-config.json
• extension-safarimv3-config.json
• extension-firefox-config.json
• extension-bravemv3-config.json
• ios-config.json
• macos-config.json
• extension-edge-config.json
• extension-chromemv3-config.json
• extension-config.json
• windows-config.json
• extension-brave-config.json
• extension-edgmv3-config.json

Last updated: 2025-12-24 14:26:13 UTC