[ci-scan-net11] net11.0 ShellBadge UI tests fail with visual regression on macOS, MacCatalyst, iOS (recurring since June 9)

[github-actions]

Summary

Four ShellBadge* UI tests fail with VisualTestFailedException across macOS, MacCatalyst, iOS CoreCLR, and iOS Mono platforms. The snapshot differences are small (0.65%–2.92%) but consistent. Tests were passing before build 1454302 (June 8) and started failing at build 1456236 (June 9), indicating a regression introduced around that date.

Build Information

• Pipeline: maui-pr-uitests (definition 313)
• Build: 1466210
• Branch: net11.0
• First seen: build 1456236 (~June 9, 2026)
• Occurrences: 2+ confirmed (1466210, 1456236)

Affected Legs

• macOS UITests — Controls (v18.5) Shell job
• MacCatalyst UITests CoreCLR — Controls Shell job
• iOS UITests CoreCLR — Controls (v18.5) Shell job
• iOS UITests Mono — Controls (vlatest) Shell job

Error Message

VisualTestUtils.VisualTestFailedException :
Snapshot different than baseline: ShellBadgeCanBeCleared.png (0.65%–0.73% difference)
Snapshot different than baseline: ShellBadgeCanBeSetAtRuntime.png (1.05%–1.74% difference)
Snapshot different than baseline: ShellBadgeInitialBadgeIsVisible.png (1.05%–1.74% difference)
Snapshot different than baseline: ShellBadgeMultipleTabsCanHaveBadges.png (1.55%–2.92% difference)

Note: Android passes these same tests — the regression is specific to macOS/iOS/MacCatalyst rendering.

Recommended Action

Look for commits merged around June 9, 2026 that touched Shell badge rendering, tab bar drawing, or macOS/iOS platform rendering paths. If the snapshots reflect an intentional visual change (e.g., font, spacing, badge shape update), update the baseline images. If unintentional, revert or fix the rendering change in src/Controls/src/Core/Shell/ or the platform-specific Shell handlers.

Generated by CI Failure Scanner (net11.0) · sonnet46 18.5M · ◷

[Shalini-Ashokan]

Failure summary : In iOS Shell tabs (Issue8305), badge colors are set correctly per tab (Tab1 = blue, Tab2 = red), but both visible badges can render in the selected tab’s color (often blue). When selection changes, other tab badges can also change to match the selected tab.

Root cause : On iOS 15+, badge background color set through UITabBarItemAppearance (BadgeBackgroundColor) appears selection-state-driven, so selected-tab appearance can dominate rendering across visible tabs.

Native iOS : It keeps badge colors independent per tab (Tab1 stays blue, Tab2 stays red), including after tab switches.

Test cases	Android	iOS
ShellBadgeInitialBadgeIsVisible (Issue8305)

[github-actions]

Closed by #36026 (merged to net11.0). GitHub only auto-closes for PRs merged to the default branch; this issue was fixed by a PR merged to a non-default branch.