Fix iOS 26 Stepper overlap in landscape

[AdamEssenmacher]

Description of Change

Extends the existing iOS 26 UIStepper Liquid Glass workaround for landscape orientation.

On iOS 26.4, the stepper glass pill can render farther outside its logical UIKit bounds than the previous 20pt compensation covered, causing adjacent controls in horizontal layouts to appear inside the visible stepper pill. This updates the landscape-only compensation to 36pt, keeps the existing iOS 26+ and non-MacCatalyst guards, and refreshes only the affected iOS 26 landscape visual baseline.

No public API changes.

Validation performed:

• Built and ran ManualTests on iOS 26.4.
• Verified D Editor -> D10 in landscape; the 0 label is fully outside the stepper glass pill.
• Rechecked the same ManualTests scenario on iOS 18.6; layout remains unchanged.
• Ran the existing Issue34273 iOS visual tests on iPhone 11 Pro iOS 26.4:
  • Passed: 2, Failed: 0

Issues Fixed

Fixes #35211

[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/dotnet/maui/main/eng/scripts/get-maui-pr.sh | bash -s -- 35374

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/dotnet/maui/main/eng/scripts/get-maui-pr.ps1) } 35374"

[dotnet-policy-service]

Hey there @@AdamEssenmacher! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[jfversluis]

/azp run maui-pr

[Copilot]

Pull request overview

Updates the iOS 26+ UIStepper “Liquid Glass” layout compensation used by StepperHandler.GetDesiredSize so that, in landscape orientation on iOS (not MacCatalyst), adjacent controls no longer render visually inside the stepper’s glass pill overflow on iOS 26.4.

Changes:

• Increase the landscape-only overflow compensation from 20pt to 36pt for iOS 26.4 behavior.
• Update inline documentation to reflect the new empirical measurement and re-verification details.

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[MauiBot]

🤖 AI Summary

👋 @AdamEssenmacher — new AI review results are available. Please review the latest session below.

📊 Review Session — 35f2271 · Fix iOS 26 Stepper landscape overlap · 2026-05-11 15:55 UTC

🚦 Gate — Test Before & After Fix

Gate Result: ⚠️ SKIPPED

No tests were detected in this PR.

Recommendation: Add tests to verify the fix using the write-tests-agent.

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🧪 UI Tests — ViewBaseTests

Detected UI test categories: ViewBaseTests

🧪 UI Test Execution Results

⏭️ SKIPPED — 0 passed, 0 failed, 1 skipped (platform: ios)

Category	Result	Tests	Duration	Notes
ViewBaseTests	⏭️ SKIPPED	—	0s	Runner threw an exception

Failures here are informational only — they do not block the gate or affect try-fix candidate scoring.

✅ Deep UI tests — 112 passed, 0 failed across 1 category on platform-pool agent (replaces in-process counts above).

🧪 UI Test Execution Results (deep, platform pool)

Category	Tests	Snapshot diffs
ios_ui_tests-controls-ViewBaseTests	112/112 ✓	—
📎 Download drop-deep-uitests artifact (TRX + snapshot diffs)

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🔍 Pre-Flight — Context & Validation

Pre-Flight — PR #35374

Summary

Fix iOS 26 Stepper overlap in landscape (issue #35211). PR extends an existing iOS 26 UIStepper Liquid Glass workaround:

• src/Core/src/Handlers/Stepper/StepperHandler.iOS.cs
  • Constant iOSLiquidGlassStepperOverflow changed 20 → 36 pts.
  • Comments updated (measured on iOS 26.4 with a small safety margin).
• src/Controls/tests/TestCases.iOS.Tests/snapshots/ios-26/EditorNoOverlapAfterRotateToLandscape.png — visual baseline refreshed.

Issue context

• Issue: [.NET10] D10-The number and buttons overlap after rotating the simulator. #35211 — Stepper buttons/value overlap after rotating simulator (D10 in ManualMaui).
• Regressed in 10-rc2; reproduces on iOS 26 simulator landscape.
• Root cause: iOS 26 UIStepper Liquid Glass pill renders visually outside its logical UIKit frame; UIKit size APIs return pre-glass logical width (~94 pts). An earlier fix ([.NET10] D10 - Customize cursor position - Rotating simulator makes the button and label overlap #34273) added a 20 pt landscape compensation; on iOS 26.4 the pill extends further so adjacent controls in horizontal layouts still overlap the visible pill.

Classification

• Files: 1 .ios.cs handler + 1 snapshot PNG.
• Risk: low — code change is a constant + comments; logical control flow unchanged.
• iOS only, MacCatalyst excluded, iOS 26+ gated, landscape gated.
• No public API changes.

Gate

Gate ⚠️ SKIPPED — no new test added; existing Issue34273 visual tests cover the scenario and the PR updated their iOS 26 landscape baseline. Recommend author add a regression assertion or note coverage explicitly. Existing iOS visual tests passed locally per PR description (Passed: 2, Failed: 0).

Code-review summary (advisory hints for Try-Fix)

• ❌ Errors: None — guards and platform checks remain correct.
• ⚠️ Warnings:
  • Magic constant approach: bumping 20 → 36 is empirical and unstable across iOS minor versions. The same pattern already shipped once and now needs a 2nd tune; a more principled approach (read from rendered glass layer bounds or insets) would be more durable.
  • Safety-margin amount not documented (is 36 = 28 measured + 8 margin? unclear). Future maintainers won't know which part is "real" vs "buffer".
  • UIScreen.MainScreen.Bounds is used for orientation — deprecated/unreliable in multi-window scenarios. Existing pattern is preserved, but could yield wrong compensation on iPad split-view or external display.
  • Snapshot test path is iOS-26-specific; the updated baseline is only verified for one simulator/device. iPad / iPhone Pro Max landscape may still overflow if width differs.
• 💡 Suggestions:
  • Consider deriving overflow from UIStepper.Layer.Frame vs Bounds post-layout (one-time on first layout), falling back to constant.
  • Apply compensation to both leading + trailing or use a measured per-orientation value.
• Failure modes:
  • iOS 26.5+ further increases overflow → constant becomes stale again.
  • Stepper inside RTL HorizontalStackLayout: overflow is on UIKit trailing edge; in RTL, trailing is opposite of LTR. Current code adds to width regardless — if the visible overflow is leading in RTL, the wrong side gets padded.
  • Stepper inside scroll views / non-stack layouts: extra width creates unused space on the right.
• Blast radius: Runs in GetDesiredSize for every Stepper on iOS 26+ in landscape. Negligible perf cost; visible layout impact only.
• Verdict: NEEDS_DISCUSSION (low-medium confidence) — fix solves the reported case but doubles the magic constant; principled alternatives exist.

Test evidence

• PR description states Issue34273 visual tests pass on iPhone 11 Pro iOS 26.4 (2/0).
• Visual snapshot updated.

Platform for testing

iOS (per task input).

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🔧 Fix — Analysis & Comparison

Try-Fix Aggregate Summary — PR #35374

Four independent fix candidates were generated using different maui-expert-reviewer dimensions. None were executed against an iOS 26.4 simulator (no test infrastructure available in the autonomous environment), so all test-result columns are marked ⚠️ NOT VERIFIED.

Fix Candidates

#	Source	Dimension	Approach	Test Result	Files Changed	Notes
1	try-fix-1	Handler patterns / Layout	Derive overflow from AlignmentRectInsets at runtime	⚠️ Static-analysis FAIL	1	Pre-flight notes state AlignmentRectInsets reports pre-glass size; would regress fix
2	try-fix-2	iOS Platform / version	Apply 36 only on iOS 26.4+, keep 20 for 26.0-26.3	⚠️ Not verified	1	Plausible; conservative for already-shipped subversions
3	try-fix-3	Performance / regression	Replace UIScreen.MainScreen with Window.WindowScene.InterfaceOrientation	⚠️ Not verified	1	Good follow-up cleanup, wrong scope for SR fix
4	try-fix-4	API design / extensibility	Convert const to internal tunable static	⚠️ Not verified	1	Marginal benefit, new mutable static — reject
pr	PR #35374	(submitted fix)	Bump 20 → 36, refresh snapshot	✅ Author validated: Issue34273 iOS visual tests 2/0 on iPhone 11 Pro iOS 26.4	2	Minimal, surgical
pr+rev	Branch A	Code review applied	Split 36 = 30 measured + 6 safety + tighter comments	✅ Behaviorally identical to pr	1	Adds maintainability without behavior change

Cross-Pollination

Model / dimension	Round	New Ideas?	Details
Handler patterns	2	No	Dynamic measurement blocked by UIKit reporting pre-glass size
iOS Platform	2	No	Version-scoped constant already covered
Performance/regression	2	No	Multi-window orientation already proposed; out of scope
API design	2	No	Tunable static already proposed; not worth the surface

Exhausted: Yes — no new viable ideas after cross-pollination.

Selected Fix

pr-plus-reviewer — keeps the PR's minimal, validated behavior change (constant bumped, snapshot refreshed) and layers on a low-risk maintainability improvement (split into measured + safety constants; concrete iOS subversion documented; de-duplicated comment).

pr is also acceptable to merge as-is — pr-plus-reviewer is a strict super-set, never worse. The four try-fix alternatives are either incorrect (try-fix-1), out-of-scope (try-fix-3), or strictly inferior (try-fix-2 unnecessarily branches; try-fix-4 adds mutable surface).

Test verification caveat

All candidates that change behavior would need to be validated on an iOS 26.4 simulator against the Issue34273 visual tests. Only pr has that validation (per PR description); pr-plus-reviewer inherits it because the behavior is bit-identical.

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📋 Report — Final Recommendation

Phase 3 — Report

Candidate ranking

Rank	Candidate	Verified behavior	Risk	Maintainability	Verdict
🥇 1	pr-plus-reviewer	✅ Behavior-identical to pr (same 36 total)	Low	Best — measured + safety split, concrete iOS subversion documented	Recommend
🥈 2	pr	✅ Author-validated Issue34273 2/0 on iOS 26.4	Low	Good — minimal, surgical	Acceptable as-is
3	try-fix-2	⚠️ Not verified	Low-medium	OK — adds version branch	Plausible alternative; depends on whether iOS 26.0-26.3 needed 36 or 20
4	try-fix-3	⚠️ Not verified	Medium	Cleanup, not a fix	Out of scope for SR fix — file separately
5	try-fix-4	⚠️ Not verified	Low	Marginal	Rejects added mutable static for no behavior gain
6	try-fix-1	❌ Static analysis FAIL — AlignmentRectInsets reports pre-glass size	High	Would regress fix	Rejected

Test verification ranking note

Per the task rules, candidates that failed regression tests rank below ones that passed. Only pr has direct verification (per author description); pr-plus-reviewer is byte-identical at runtime so it inherits that verification. Try-fix-1 is statically known to break the fix; ranked last. The other try-fix candidates are unverified — ranked below the verified pair.

Selected winner: pr-plus-reviewer

The PR's behavioral change (bump iOSLiquidGlassStepperOverflow 20 → 36 in landscape on iOS 26+) is correct and validated for the reported scenario. The maintainability concerns flagged by code review are real (the constant has been retuned twice across iOS 26.x; the safety margin amount is undocumented in the PR). pr-plus-reviewer keeps the same compensation amount and same control flow, but splits the literal into measured + safety and pins a concrete iOS subversion in the comment — so the next maintainer touching this code on iOS 26.5 has the data they need.

If the team prefers minimal SR diffs, pr is also fine to merge as-is. The expert review feedback can land as a separate cleanup PR.

What was NOT verified

• All try-fix candidates were not run against an iOS 26.4 simulator (no test infra in the autonomous environment).
• iPad multi-window orientation behavior (raised by try-fix-3) is not covered by the existing Issue34273 visual tests.
• iOS 26.0-26.3 layout (raised by try-fix-2) is not separately validated; the 36 value may over-pad on those subversions.

Suggested PR follow-ups (not blocking merge)

1. Author should consider applying the pr-plus-reviewer comment/constant split (see inline findings).
2. Track migration off UIScreen.MainScreen.Bounds to WindowScene.InterfaceOrientation for iPad multi-window correctness (try-fix-3) as a separate cleanup issue.
3. Add a unit test that asserts GetDesiredSize reports logical_width + 36 in landscape on iOS 26+ (mockable via IsLandscape extraction) so future tuning is regression-protected without needing a visual snapshot run.

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