Add browser UI lock overflow regression tests

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Asana Task/Github Issue: N/A

Description

Adds focused BrowserUiLock unit coverage for the recent overflow-y gating behavior:

• Risky behavior now covered: pages with no visible scrollbar no longer lock browser UI gestures unless html or body explicitly uses a configured locking overflow-y value.
• Test files updated: injected/unit-test/browser-ui-lock.js.
• Why this materially reduces regression risk: this covers the false-positive lock prevention path directly in _detectShouldLock(), plus a positive control that an explicit locking overflow still locks. A regression here could disable browser UI gestures on pages that are merely non-scrollable.

Testing Steps

• npm run test-unit -w injected -- --filter=BrowserUiLock
• npm run build-locales -w injected && npm run lint-fix

Checklist

Please tick all that apply:

• I have tested this change locally
• I have tested this change locally in all supported browsers
• This change will be visible to users
• I have added automated tests that cover this change
• I have ensured the change is gated by config
• This change was covered by a ship review
• This change was covered by a tech design
• Any dependent config has been merged

  

[github-actions]

Build Branch

Branch	pr-releases/jkt/auto/regression-test-coverage-6d36
Commit	7aff1a74d4
Updated	May 4, 2026 at 8:11:42 AM UTC

Static preview entry points

• Docs: docs/index.html
• Static pages: build/integration/pages/index.html
• Integration pages: injected/integration-test/test-pages/index.html

QR codes (mobile preview)

Entry point	QR code
Docs
Static pages
Integration pages

Integration commands

npm (Android / Extension):

npm i github:duckduckgo/content-scope-scripts#pr-releases/jkt/auto/regression-test-coverage-6d36

Swift Package Manager (Apple):

.package(url: "https://github.com/duckduckgo/content-scope-scripts.git", branch: "pr-releases/jkt/auto/regression-test-coverage-6d36")

git submodule (Windows):

git -C submodules/content-scope-scripts fetch origin pr-releases/jkt/auto/regression-test-coverage-6d36
git -C submodules/content-scope-scripts checkout origin/pr-releases/jkt/auto/regression-test-coverage-6d36

Pin to exact commit

npm (Android / Extension):

npm i github:duckduckgo/content-scope-scripts#7aff1a74d421f283a42040da0686bebb035c64cc

Swift Package Manager (Apple):

.package(url: "https://github.com/duckduckgo/content-scope-scripts.git", revision: "7aff1a74d421f283a42040da0686bebb035c64cc")

git submodule (Windows):

git -C submodules/content-scope-scripts fetch origin pr-releases/jkt/auto/regression-test-coverage-6d36
git -C submodules/content-scope-scripts checkout 7aff1a74d421f283a42040da0686bebb035c64cc

[github-actions]

[Beta] Generated file diff

Time updated: Mon, 04 May 2026 08:12:32 GMT