[Android] Fix CollectionView dynamic item sizing reset after scroll by Vignesh-SF3580 · Pull Request #34882 · dotnet/maui

Vignesh-SF3580 · 2026-04-08T15:06:27Z

Note

Are you waiting for the changes in this PR to be merged?
It would be very helpful if you could test the resulting artifacts from this PR and let us know in a comment if this change resolves your issue. Thank you!

Issue Details

After tapping CollectionView images to dynamically resize them, scrolling items off-screen and back causes all images to reset to their original size.

This is a failure on the candidate branch. A PR was previously created against inflight/candidate: #34828. It was closed when the inflight PR was merged into main. A new PR has now been created targeting main.

Regression Details

The regression was introduced by PR #34534.

Root Cause

In PR #34534, TemplatedItemViewHolder.Recycle() set View = null and _selectedTemplate = null, which forced Bind() to recreate the view from the DataTemplate on every scroll recycle. Since the template defines HeightRequest = 60, any runtime size changes made by the user were lost.

Description of Change

Recycle(): Removed View = null and _selectedTemplate = null. Now only _itemContentView.Recycle() is called, which disconnects the native handler while preserving the MAUI view reference.
Bind(): Added a View?.Handler is null check within the existing if (!templateChanging) block. When the handler has been disconnected during recycle and the template has not changed, PropagatePropertyChanged and RealizeContent(View, itemsView) are invoked to reconnect the native handler to the existing MAUI view, preserving runtime property changes without recreating the view.

Issues Fixed

Fixes #34783

Screenshots

Before Issue Fix	After Issue Fix
34783BeforeFix.mov	34783AfterFix.mov

…e scrollbar, all images will automatically return to their original size

github-actions · 2026-04-08T15:07:09Z

🚀 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 -- 34882

Or

Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/dotnet/maui/main/eng/scripts/get-maui-pr.ps1) } 34882"

Copilot

Pull request overview

Fixes an Android CollectionView regression where dynamically resized item views reset to their original size after being scrolled off-screen and recycled.

Changes:

Adjusts TemplatedItemViewHolder.Recycle()/Bind() to preserve the MAUI view instance across recycle and re-realize platform content when the handler has been disconnected.
Adds a HostApp reproduction page for Issue #34783 (dynamic image resizing in a CollectionView).
Adds an Appium/NUnit UI test intended to verify the resized state persists after scroll/recycle.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
`src/Controls/src/Core/Handlers/Items/Android/TemplatedItemViewHolder.cs`	Preserves `View`/`_selectedTemplate` across recycle and reconnects platform content when rebinding with the same template.
`src/Controls/tests/TestCases.HostApp/Issues/Issue34783.cs`	Adds a HostApp issue page that reproduces dynamic item resizing and scroll/recycle behavior.
`src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue34783.cs`	Adds a UI test to validate image size persists after scrolling/recycling.

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue34783.cs

src/Controls/tests/TestCases.HostApp/Issues/Issue34783.cs

MauiBot · 2026-04-08T16:14:32Z

🚦 Gate - Test Before and After Fix

📊 Expand Full Gate — 3673d73 · Addressed AI concerns.

Gate Result: ⚠️ ENV ERROR

Platform: ANDROID · Base: main · Merge base: b43bdad1

Test	Without Fix (expect FAIL)	With Fix (expect PASS)
🖥️ Issue34783 `Issue34783`	⚠️ ENV ERROR	✅ PASS — 529s

🔴 Without fix — 🖥️ Issue34783: ⚠️ ENV ERROR · 1698s

(truncated to last 15,000 chars)

stCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-android]
/home/vsts/work/1/s/.dotnet/packs/Microsoft.Android.Sdk.Linux/36.1.2/tools/Xamarin.Android.Common.Debugging.targets(333,5): error ADB0010:    at Xamarin.Android.Tasks.FastDeploy.InstallPackage(Boolean installed) [/home/vsts/work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-android]
/home/vsts/work/1/s/.dotnet/packs/Microsoft.Android.Sdk.Linux/36.1.2/tools/Xamarin.Android.Common.Debugging.targets(333,5): error ADB0010:    at Xamarin.Android.Tasks.FastDeploy.InstallPackage(Boolean installed) [/home/vsts/work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-android]
/home/vsts/work/1/s/.dotnet/packs/Microsoft.Android.Sdk.Linux/36.1.2/tools/Xamarin.Android.Common.Debugging.targets(333,5): error ADB0010:    at Xamarin.Android.Tasks.FastDeploy.RunInstall() [/home/vsts/work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-android]

Build FAILED.

/home/vsts/work/1/s/.dotnet/packs/Microsoft.Android.Sdk.Linux/36.1.2/tools/Xamarin.Android.Common.Debugging.targets(333,5): error ADB0010: Mono.AndroidTools.InstallFailedException: Unexpected install output: cmd: Failure calling service package: Broken pipe (32) [/home/vsts/work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-android]
/home/vsts/work/1/s/.dotnet/packs/Microsoft.Android.Sdk.Linux/36.1.2/tools/Xamarin.Android.Common.Debugging.targets(333,5): error ADB0010:  [/home/vsts/work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-android]
/home/vsts/work/1/s/.dotnet/packs/Microsoft.Android.Sdk.Linux/36.1.2/tools/Xamarin.Android.Common.Debugging.targets(333,5): error ADB0010:    at Mono.AndroidTools.Internal.AdbOutputParsing.CheckInstallSuccess(String output, String packageName) [/home/vsts/work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-android]
/home/vsts/work/1/s/.dotnet/packs/Microsoft.Android.Sdk.Linux/36.1.2/tools/Xamarin.Android.Common.Debugging.targets(333,5): error ADB0010:    at Mono.AndroidTools.AndroidDevice.<>c__DisplayClass105_0.<InstallPackage>b__0(Task`1 t) [/home/vsts/work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-android]
/home/vsts/work/1/s/.dotnet/packs/Microsoft.Android.Sdk.Linux/36.1.2/tools/Xamarin.Android.Common.Debugging.targets(333,5): error ADB0010:    at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state) [/home/vsts/work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-android]
/home/vsts/work/1/s/.dotnet/packs/Microsoft.Android.Sdk.Linux/36.1.2/tools/Xamarin.Android.Common.Debugging.targets(333,5): error ADB0010: --- End of stack trace from previous location --- [/home/vsts/work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-android]
/home/vsts/work/1/s/.dotnet/packs/Microsoft.Android.Sdk.Linux/36.1.2/tools/Xamarin.Android.Common.Debugging.targets(333,5): error ADB0010:    at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state) [/home/vsts/work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-android]
/home/vsts/work/1/s/.dotnet/packs/Microsoft.Android.Sdk.Linux/36.1.2/tools/Xamarin.Android.Common.Debugging.targets(333,5): error ADB0010:    at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread) [/home/vsts/work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-android]
/home/vsts/work/1/s/.dotnet/packs/Microsoft.Android.Sdk.Linux/36.1.2/tools/Xamarin.Android.Common.Debugging.targets(333,5): error ADB0010: --- End of stack trace from previous location --- [/home/vsts/work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-android]
/home/vsts/work/1/s/.dotnet/packs/Microsoft.Android.Sdk.Linux/36.1.2/tools/Xamarin.Android.Common.Debugging.targets(333,5): error ADB0010:    at AndroidDeviceExtensions.PushAndInstallPackageAsync(AndroidDevice device, PushAndInstallCommand command, CancellationToken token) [/home/vsts/work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-android]
/home/vsts/work/1/s/.dotnet/packs/Microsoft.Android.Sdk.Linux/36.1.2/tools/Xamarin.Android.Common.Debugging.targets(333,5): error ADB0010:    at AndroidDeviceExtensions.PushAndInstallPackageAsync(AndroidDevice device, PushAndInstallCommand command, CancellationToken token) [/home/vsts/work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-android]
/home/vsts/work/1/s/.dotnet/packs/Microsoft.Android.Sdk.Linux/36.1.2/tools/Xamarin.Android.Common.Debugging.targets(333,5): error ADB0010:    at Xamarin.Android.Tasks.FastDeploy.InstallPackage(Boolean installed) [/home/vsts/work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-android]
/home/vsts/work/1/s/.dotnet/packs/Microsoft.Android.Sdk.Linux/36.1.2/tools/Xamarin.Android.Common.Debugging.targets(333,5): error ADB0010:    at Xamarin.Android.Tasks.FastDeploy.InstallPackage(Boolean installed) [/home/vsts/work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-android]
/home/vsts/work/1/s/.dotnet/packs/Microsoft.Android.Sdk.Linux/36.1.2/tools/Xamarin.Android.Common.Debugging.targets(333,5): error ADB0010:    at Xamarin.Android.Tasks.FastDeploy.RunInstall() [/home/vsts/work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-android]
    0 Warning(s)
    1 Error(s)

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Build succeeded.
    0 Warning(s)
    0 Error(s)

Time Elapsed 00:08:36.14
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Broadcasting: Intent { act=android.intent.action.CLOSE_SYSTEM_DIALOGS flg=0x400000 }
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Test run for /home/vsts/work/1/s/artifacts/bin/Controls.TestCases.Android.Tests/Debug/net10.0/Controls.TestCases.Android.Tests.dll (.NETCoreApp,Version=v10.0)
VSTest version 18.0.1 (x64)

Starting test execution, please wait...
A total of 1 test files matched the specified pattern.
/home/vsts/work/1/s/artifacts/bin/Controls.TestCases.Android.Tests/Debug/net10.0/Controls.TestCases.Android.Tests.dll
[xUnit.net 00:00:00.00] xUnit.net VSTest Adapter v2.8.2+699d445a1a (64-bit .NET 10.0.0)
[xUnit.net 00:00:00.11]   Discovering: Controls.TestCases.Android.Tests
[xUnit.net 00:00:00.31]   Discovered:  Controls.TestCases.Android.Tests
NUnit Adapter 4.5.0.0: Test execution started
Running selected tests in /home/vsts/work/1/s/artifacts/bin/Controls.TestCases.Android.Tests/Debug/net10.0/Controls.TestCases.Android.Tests.dll
   NUnit3TestExecutor discovered 1 of 1 NUnit test cases using Current Discovery mode, Non-Explicit run
>>>>> 04/09/2026 11:20:03 FixtureSetup for Issue34783(Android)
>>>>> 04/09/2026 11:20:06 ImagesKeepSizeAfterScrolling Start
>>>>> 04/09/2026 11:20:17 ImagesKeepSizeAfterScrolling Stop
>>>>> 04/09/2026 11:20:17 Log types: logcat, bugreport, server
  Failed ImagesKeepSizeAfterScrolling [12 s]
  Error Message:
     Image should keep its enlarged size after scrolling; resetting to original size is the bug
Assert.That(afterScrollRect.Height, Is.GreaterThan(initialRect.Height))
  Expected: greater than 158
  But was:  158

  Stack Trace:
     at Microsoft.Maui.TestCases.Tests.Issues.Issue34783.ImagesKeepSizeAfterScrolling() in /_/src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue34783.cs:line 50

1)    at Microsoft.Maui.TestCases.Tests.Issues.Issue34783.ImagesKeepSizeAfterScrolling() in /_/src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue34783.cs:line 50


NUnit Adapter 4.5.0.0: Test execution complete

Test Run Failed.
Total tests: 1
     Failed: 1
 Total time: 38.0649 Seconds

🟢 With fix — 🖥️ Issue34783: PASS ✅ · 529s

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  Maps -> /home/vsts/work/1/s/artifacts/bin/Controls.TestCases.HostApp/Debug/net10.0-android/Microsoft.Maui.Maps.dll
  Controls.Core -> /home/vsts/work/1/s/artifacts/bin/Controls.TestCases.HostApp/Debug/net10.0-android/Microsoft.Maui.Controls.dll
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13787373
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  Controls.Maps -> /home/vsts/work/1/s/artifacts/bin/Controls.TestCases.HostApp/Debug/net10.0-android/Microsoft.Maui.Controls.Maps.dll
  Controls.Foldable -> /home/vsts/work/1/s/artifacts/bin/Controls.TestCases.HostApp/Debug/net10.0-android/Microsoft.Maui.Controls.Foldable.dll
  Microsoft.AspNetCore.Components.WebView.Maui -> /home/vsts/work/1/s/artifacts/bin/Controls.TestCases.HostApp/Debug/net10.0-android/Microsoft.AspNetCore.Components.WebView.Maui.dll
  Controls.Xaml -> /home/vsts/work/1/s/artifacts/bin/Controls.TestCases.HostApp/Debug/net10.0-android/Microsoft.Maui.Controls.Xaml.dll

Build succeeded.
    0 Warning(s)
    0 Error(s)

Time Elapsed 00:06:49.77
Broadcasting: Intent { act=android.intent.action.CLOSE_SYSTEM_DIALOGS flg=0x400000 }
Broadcast completed: result=0
Broadcasting: Intent { act=android.intent.action.CLOSE_SYSTEM_DIALOGS flg=0x400000 }
Broadcast completed: result=0
  Determining projects to restore...
  All projects are up-to-date for restore.
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13787373
  Graphics -> /home/vsts/work/1/s/artifacts/bin/Graphics/Debug/net10.0/Microsoft.Maui.Graphics.dll
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13787373
  Essentials -> /home/vsts/work/1/s/artifacts/bin/Essentials/Debug/net10.0/Microsoft.Maui.Essentials.dll
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13787373
  Core -> /home/vsts/work/1/s/artifacts/bin/Core/Debug/net10.0/Microsoft.Maui.dll
  Controls.CustomAttributes -> /home/vsts/work/1/s/artifacts/bin/Controls.CustomAttributes/Debug/net10.0/Controls.CustomAttributes.dll
  Controls.BindingSourceGen -> /home/vsts/work/1/s/artifacts/bin/Controls.BindingSourceGen/Debug/netstandard2.0/Microsoft.Maui.Controls.BindingSourceGen.dll
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13787373
  Controls.Core -> /home/vsts/work/1/s/artifacts/bin/Controls.Core/Debug/net10.0/Microsoft.Maui.Controls.dll
  UITest.Core -> /home/vsts/work/1/s/artifacts/bin/UITest.Core/Debug/net10.0/UITest.Core.dll
  UITest.Appium -> /home/vsts/work/1/s/artifacts/bin/UITest.Appium/Debug/net10.0/UITest.Appium.dll
  UITest.NUnit -> /home/vsts/work/1/s/artifacts/bin/UITest.NUnit/Debug/net10.0/UITest.NUnit.dll
  VisualTestUtils -> /home/vsts/work/1/s/artifacts/bin/VisualTestUtils/Debug/netstandard2.0/VisualTestUtils.dll
  VisualTestUtils.MagickNet -> /home/vsts/work/1/s/artifacts/bin/VisualTestUtils.MagickNet/Debug/netstandard2.0/VisualTestUtils.MagickNet.dll
  UITest.Analyzers -> /home/vsts/work/1/s/artifacts/bin/UITest.Analyzers/Debug/netstandard2.0/UITest.Analyzers.dll
  Controls.TestCases.Android.Tests -> /home/vsts/work/1/s/artifacts/bin/Controls.TestCases.Android.Tests/Debug/net10.0/Controls.TestCases.Android.Tests.dll
Test run for /home/vsts/work/1/s/artifacts/bin/Controls.TestCases.Android.Tests/Debug/net10.0/Controls.TestCases.Android.Tests.dll (.NETCoreApp,Version=v10.0)
VSTest version 18.0.1 (x64)

Starting test execution, please wait...
A total of 1 test files matched the specified pattern.
/home/vsts/work/1/s/artifacts/bin/Controls.TestCases.Android.Tests/Debug/net10.0/Controls.TestCases.Android.Tests.dll
[xUnit.net 00:00:00.00] xUnit.net VSTest Adapter v2.8.2+699d445a1a (64-bit .NET 10.0.0)
[xUnit.net 00:00:00.12]   Discovering: Controls.TestCases.Android.Tests
[xUnit.net 00:00:00.32]   Discovered:  Controls.TestCases.Android.Tests
NUnit Adapter 4.5.0.0: Test execution started
Running selected tests in /home/vsts/work/1/s/artifacts/bin/Controls.TestCases.Android.Tests/Debug/net10.0/Controls.TestCases.Android.Tests.dll
   NUnit3TestExecutor discovered 1 of 1 NUnit test cases using Current Discovery mode, Non-Explicit run
>>>>> 04/09/2026 11:29:26 FixtureSetup for Issue34783(Android)
>>>>> 04/09/2026 11:29:29 ImagesKeepSizeAfterScrolling Start
>>>>> 04/09/2026 11:29:39 ImagesKeepSizeAfterScrolling Stop
  Passed ImagesKeepSizeAfterScrolling [10 s]
NUnit Adapter 4.5.0.0: Test execution complete

Test Run Successful.
Total tests: 1
     Passed: 1
 Total time: 24.6209 Seconds

⚠️ Issues found

⚠️ Issue34783 without fix: Exception calling "Matches" with "2" argument(s): "Value cannot be null. (Parameter 'input')"

📁 Fix files reverted (2 files)

eng/pipelines/ci-copilot.yml
src/Controls/src/Core/Handlers/Items/Android/TemplatedItemViewHolder.cs

PureWeen · 2026-04-08T17:02:34Z

/azp run maui-pr-uitests, maui-pr-devicetests

azure-pipelines · 2026-04-08T17:03:00Z

Azure Pipelines successfully started running 2 pipeline(s).

github-actions · 2026-04-08T17:27:09Z

🧪 PR Test Evaluation

Overall Verdict: ⚠️ Tests need improvement

The test covers the primary fix scenario well (resize → scroll → verify size preserved), but uses TapCoordinates to tap the image — a fragile approach — and the AutomationId for the tapped element is dynamically data-bound rather than a static constant, causing a script false-positive mismatch warning.

👍 / 👎 — Was this evaluation helpful? React to let us know!

📊 Expand Full Evaluation

PR Test Evaluation Report

PR: #34882 — CollectionView Dynamic item sizing - After dragging the scrollbar, all images return to their original size
Test files evaluated: 2 (HostApp + NUnit test)
Fix files: 1 (TemplatedItemViewHolder.cs — Android only)

Overall Verdict

⚠️ Tests need improvement

The core scenario is well covered: tap to resize, scroll to trigger RecyclerView recycling, scroll back, verify the size was preserved. However, App.TapCoordinates(...) is used because the image has a TapGestureRecognizer (not a Button) and no stable AutomationId, which makes the tap fragile across screen sizes and DPI. The image's AutomationId is data-bound to the monkey name ("Baboon"), which works but is not documented in the HostApp source as a static constant, creating a misleading script warning.

1. Fix Coverage — ✅

The fix changes TemplatedItemViewHolder.Recycle() to keep View and _selectedTemplate references (rather than nulling them), and adds a View?.Handler is null check in Bind() to re-realize the handler when the same template is re-bound after recycling. The test exactly exercises this path:

Items load (initial Bind())
Image is tapped → HeightRequest changed from 60 → 100 (runtime property on the View)
Scroll down → item goes off-screen → Recycle() is called → handler disconnected
Scroll back up → Bind() is called again with the same template → the fix re-realizes the handler without recreating the View, preserving HeightRequest
Test asserts afterScrollRect.Height > initialRect.Height — this would fail with the old code (where View = null forced full recreate, resetting HeightRequest)

The test would fail if the fix were reverted. ✅

2. Edge Cases & Gaps — ⚠️

Covered:

Single-item resize (60 → 100) followed by scroll-triggered recycling
Verifies both the enlarged state and the post-scroll state

Missing:

Resize in reverse: After scrolling back, tap again to shrink (100 → 60) and scroll again — verifies the fix works bidirectionally and doesn't break normal recycling.
Multiple items resized: Resize several items, scroll past all of them, scroll back — verifies the fix handles multiple recycled holders concurrently.
DataTemplate switch path: The fix only applies to !templateChanging branch. A complementary test for templateChanging=true (e.g., items with a DataTemplateSelector) would confirm no regression there.
Null handler check: The fix adds if (View?.Handler is null) — the test exercises the Handler == null path (after Recycle()), but doesn't cover the case where Handler != null (no-op path).

3. Test Type Appropriateness — ✅

Current: UI Test (Appium)
Recommendation: UI Test is appropriate here.

The bug requires actual Android RecyclerView item recycling (ViewHolder.Recycle() / re-Bind()), which only triggers when items scroll off-screen in a real native list. This cannot be tested at the unit or device-test level without a real running layout. A UI test is the correct choice.

4. Convention Compliance — ⚠️

✅ [Issue()] attribute with PlatformAffected.Android
✅ [Category(UITestCategories.CollectionView)] — exactly one
✅ Inherits _IssuesUITest
✅ App.WaitForElement("Baboon") before interactions
✅ No Task.Delay / Thread.Sleep
✅ No inline #if ANDROID / #if IOS
✅ No obsolete APIs
⚠️ Dynamic AutomationId: The image's AutomationId is set via image.SetBinding(Image.AutomationIdProperty, new Binding("Name")), making "Baboon" a data-driven value, not a declared constant. The script correctly warns: Test references AutomationId Baboon not found in HostApp. While it works at runtime, it is fragile — a data change would silently break the test.
⚠️ #if TEST_FAILS_ON_CATALYST wrapping: The comment explains the test is flaky on MacCatalyst due to scroll-recycle timing. This is an accepted pattern in the MAUI test suite (see Issue29261, Issue29923), but it's worth noting that because the fix is Android-only, this guard may be unnecessary complexity (the test would not be meaningful on Catalyst regardless).

5. Flakiness Risk — ⚠️ Medium

Risk Factor	Status
`TapCoordinates` to hit image	⚠️ Fragile — coordinates depend on rendered layout; can shift with system font size, DPI, or device screen
No stable `AutomationId` on tapped image	⚠️ The test relies on data-bound `"Baboon"` name, not a static ID
Multiple `ScrollUp` calls to return to top	⚠️ Two gesture scrolls may not be sufficient on larger screens or emulators with different scroll velocities
No `retryTimeout` on `WaitForElement` after scrolling	Low — not a screenshot test; element presence assertion is adequate
`ScrollStrategy.Gesture`	Accepted pattern in MAUI UI tests; low risk

Recommendation: Replace TapCoordinates with a stable approach. One option is to add a dedicated Button or use a TapGestureRecognizer on an Image that has a static AutomationId separate from the data-bound name. Another is to keep the image name binding and add a static AutomationId prefix (e.g., $"img_{Name}").

6. Duplicate Coverage — ✅ No duplicates

No existing test covers this exact scenario (dynamic HeightRequest surviving RecyclerView recycling). The listed similar tests (Issue10025, Issue11896, Issue15173, CollectionViewUITests.HiddenCollectionViewBind) cover unrelated scenarios.

7. Platform Scope — ✅

Fix is in src/Controls/src/Core/Handlers/Items/Android/TemplatedItemViewHolder.cs — Android-only.
HostApp page: PlatformAffected.Android.
The #if TEST_FAILS_ON_CATALYST guard excludes MacCatalyst. The test runs on Android and iOS (though the bug is Android-specific, running on iOS is harmless).
Platform scope is appropriate. ✅

8. Assertion Quality — ✅

Assert.That(enlargedRect.Height, Is.GreaterThan(initialRect.Height), "...");
Assert.That(afterScrollRect.Height, Is.GreaterThan(initialRect.Height), "...");

Uses relative comparisons (GreaterThan) rather than hardcoded pixel values — robust across screen sizes. ✅
Both assertions include descriptive failure messages. ✅
Two assertions: one confirms the tap worked (precondition), one tests the actual fix. Good structure. ✅

9. Fix-Test Alignment — ✅

The fix is in TemplatedItemViewHolder.Bind() / Recycle() — the Android ViewHolder for CollectionView items. The test uses a CollectionView with a DataTemplate (matching _template / _selectedTemplate) and triggers recycling via scroll gestures. The test precisely exercises the changed code path. ✅

Recommendations

Replace TapCoordinates with a stable AutomationId-based tap. Add a static AutomationId to the image (e.g., "FirstMonkeyImage") rather than relying on the data-bound name "Baboon". This decouples the test from the test data and makes the AutomationId reference explicit in source code.
Optionally add a "resize back" + scroll sub-step. After verifying the enlarged size is preserved, tap again (shrink back to 60) and scroll once more — verifying bidirectional sizing works and the fix didn't introduce a one-way persistence issue.
Clarify the #if TEST_FAILS_ON_CATALYST intent. Since this is an Android-only fix (PlatformAffected.Android), consider whether the MacCatalyst guard is needed. If the test is intended to only run on Android, the HostApp [Issue] attribute already scopes it. The #if guard primarily protects against CI flakiness on Catalyst, which is valid — but the comment could note that the test is primarily meaningful on Android.

Note

🔒 Integrity filtering filtered 2 items

Integrity filtering activated and filtered the following items during workflow execution.
This happens when a tool call accesses a resource that does not meet the required integrity or secrecy level of the workflow.

pr:[Android] Fix CollectionView dynamic item sizing reset after scroll #34882 (pull_request_read: Resource 'pr:[Android] Fix CollectionView dynamic item sizing reset after scroll #34882' has lower integrity than agent requires. Agent would need to drop integrity tags [unapproved:all approved:all] to trust this resource.)
pr:[Android] Fix CollectionView dynamic item sizing reset after scroll #34882 (pull_request_read: Resource 'pr:[Android] Fix CollectionView dynamic item sizing reset after scroll #34882' has lower integrity than agent requires. Agent would need to drop integrity tags [approved:all unapproved:all] to trust this resource.)

🧪 Test evaluation by Evaluate PR Tests

MauiBot · 2026-04-08T18:10:43Z

🤖 AI Summary

📊 Expand Full Review — 3673d73 · Addressed AI concerns.

🔍 Pre-Flight — Context & Validation

Issue: #34783 - CollectionView Dynamic item sizing - After dragging the scrollbar, all images will automatically return to their original size
PR: #34882 - [Android] Fix CollectionView dynamic item sizing reset after scroll
Platforms Affected: Android only (regression introduced by PR #34534)
Files Changed: 1 implementation, 2 test

Key Findings

Regression introduced by PR [Android, Windows] Fix CollectionView handler cleanup when DataTemplateSelector switches templates #34534: TemplatedItemViewHolder.Recycle() set View = null and _selectedTemplate = null, forcing Bind() to always recreate the MAUI view from the DataTemplate on recycle, losing any runtime property changes (e.g. dynamic HeightRequest).
PR fix: Recycle() no longer nulls out View or _selectedTemplate — only calls _itemContentView.Recycle() to disconnect the native handler. Bind() adds a View?.Handler is null check inside the !templateChanging block: when the handler was disconnected but the template hasn't changed, it calls PropagatePropertyChanged + RealizeContent to reconnect the native handler to the existing MAUI view, preserving runtime property changes.
Test type: UI Test (_IssuesUITest, BuildAndRunHostApp.ps1)
Prior agent review exists at commit 2b22463. All 4 inline review threads (retry-assert, WaitForNoElement, HostApp labels, platform guard) have been resolved in the current commit 3673d73. The platform guard issue (using #if TEST_FAILS_ON_CATALYST instead of Android-only) was acknowledged by the author as intentional — they want cross-platform coverage.
Gate result from caller: ✅ PASSED (tests FAIL without fix, PASS with fix).

Fix Candidates

#	Source	Approach	Test Result	Files Changed	Notes
PR	PR #34882	Preserve `View`/`_selectedTemplate` across `Recycle()`; reconnect native handler in `Bind()` when `Handler is null` and template unchanged	✅ PASSED (Gate)	`TemplatedItemViewHolder.cs`	Original PR

🔧 Fix — Analysis & Comparison

Fix Candidates

#	Source	Approach	Test Result	Files Changed	Notes
1	try-fix (claude-opus-4.6)	Lightweight Detach/Reattach - avoid handler disconnection during recycle; add Detach/Reattach to ItemContentView, keep handler alive	PASS	ItemContentView.cs + TemplatedItemViewHolder.cs	Never disconnects handler; modifies more API surface (2 files)
2	try-fix (claude-sonnet-4.6)	Property Snapshot - static ConditionalWeakTable keyed on binding context, captures non-default layout props on Recycle, restores after fresh view creation	PASS	TemplatedItemViewHolder.cs	More complex (~95 lines added); 2 iterations to compile
3	try-fix (gpt-5.3-codex)	ItemsView-scoped recycled view cache keyed by (bindingContext, DataTemplate) - keeps View=null behavior but retrieves cached MAUI view in Bind()	PASS	TemplatedItemViewHolder.cs	Interesting but introduces cache memory management complexity
4	try-fix (gpt-5.4)	Mutation-aware recycle preservation - only preserves views whose request values changed from template baseline; unmutated cells still rebuild normally	PASS	TemplatedItemViewHolder.cs	Good concept but adds baseline-snapshot overhead for every cell
PR	PR #34882	Preserve View/_selectedTemplate across Recycle(); reconnect handler in Bind() when Handler is null	PASSED (Gate)	TemplatedItemViewHolder.cs	Simplest; 1 file, ~12 lines; minimal API change

Cross-Pollination

Model	Round	New Ideas?	Details
claude-opus-4.6	2	No	NO NEW IDEAS
claude-sonnet-4.6	2	No	NO NEW IDEAS

Exhausted: Yes
Selected Fix: PR's fix - simplest implementation (1 file, ~12 lines changed), minimal API surface, correct approach that reconnects rather than avoids disconnection, consistent with MAUI's existing handler lifecycle patterns.

📋 Report — Final Recommendation

Final Recommendation: APPROVE

Phase Status

Phase	Status	Notes
Pre-Flight	COMPLETE	Issue 34783, Android-only regression from PR 34534
Gate	PASSED	Android - tests FAIL without fix, PASS with fix
Try-Fix	COMPLETE	4 attempts, 4 passing; PR fix selected as best
Report	COMPLETE

Summary

PR 34882 is a targeted Android fix for a regression introduced by PR 34534, where CollectionView items lost dynamically changed sizes (e.g. HeightRequest 60 to 100) after scrolling off-screen and back. The fix is simple, correct, and minimal. Gate passed. All 4 independent try-fix models confirmed the fix direction. The PR fix is the simplest of all candidates and should be approved.

Root Cause

PR 34534 modified TemplatedItemViewHolder.Recycle() to set View = null and _selectedTemplate = null after disconnecting the native handler. This forced Bind() to always take the templateChanging = true path, recreating the MAUI view from DataTemplate on every scroll recycle. Since DataTemplate always initializes with HeightRequest = 60, any runtime property changes were discarded.

Fix Quality

Correct: Keeps View and _selectedTemplate across Recycle() so Bind() detects template unchanged and reuses the existing MAUI view. A Handler is null check reconnects the native platform handler without recreating the view, preserving runtime property changes.

Simple: Only TemplatedItemViewHolder.cs is modified (~12 net lines). No new API surface, no new data structures.

Try-Fix comparison: All 4 alternative approaches passed but were more complex. The PR fix is the clear winner on simplicity.

Minor concerns (non-blocking):

Test guard: Test uses #if TEST_FAILS_ON_CATALYST instead of #if ANDROID. The fix is Android-only (Items/Android handler) but the test will also compile and attempt to run on iOS/Windows where the HostApp page is registered as PlatformAffected.Android. This may result in test infrastructure handling it correctly or silently, but using #if ANDROID would be cleaner and less ambiguous.
Redundant null propagation: View?.Handler is null uses the null-conditional operator, but View was already dereferenced on the line above (View.BindingContext = ...) so a NRE would have already occurred if View were null. Style-only issue.

Neither concern blocks merge. Gate confirmed the fix works correctly on Android.

Vignesh-SF3580 · 2026-04-09T08:09:42Z

🤖 AI Summary

📊 Expand Full Review — 2b22463 · Fixed-34783: [MAUI] I3_Sizing_Dynamic item sizing - After dragging the scrollbar, all images will automatically return to their original size

The test is intentionally written for all platforms, as cross-platform coverage is expected in MAUI. Restricting it to Android-only would unnecessarily reduce coverage, so the test is left as-is.
The post-tap assertion has been updated to use App.RetryAssert to handle async layout or measure delays and avoid flakiness.
Added App.WaitForNoElement("Baboon") after scrolling down to verify the item is no longer visible before scrolling back up.

sheiksyedm · 2026-04-09T09:38:42Z

/azp run maui-pr-uitests

azure-pipelines · 2026-04-09T09:38:55Z

Azure Pipelines successfully started running 1 pipeline(s).

PureWeen · 2026-04-09T17:18:22Z

/azp run maui-pr-devicetests

azure-pipelines · 2026-04-09T17:18:30Z

No pipelines are associated with this pull request.

azure-pipelines · 2026-04-09T17:18:44Z

Azure Pipelines successfully started running 1 pipeline(s).

The ImagesKeepSizeAfterScrolling test times out on WinUI because WaitForNoElement("Baboon") fails — Windows scroll behavior doesn't push the first item off-screen the same way Android RecyclerView does. Since the fix only targets Android (TemplatedItemViewHolder), exclude both MacCatalyst and Windows from this test. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

PureWeen · 2026-04-09T20:29:34Z

/azp run maui-pr-uitests, maui-pr-devicetests

azure-pipelines · 2026-04-09T20:29:49Z

Azure Pipelines successfully started running 2 pipeline(s).

Fixed-34783: [MAUI] I3_Sizing_Dynamic item sizing - After dragging th…

2b22463

…e scrollbar, all images will automatically return to their original size

dotnet-policy-service bot added the partner/syncfusion Issues / PR's with Syncfusion collaboration label Apr 8, 2026

Vignesh-SF3580 added the community ✨ Community Contribution label Apr 8, 2026

Vignesh-SF3580 added area-controls-collectionview CollectionView, CarouselView, IndicatorView platform/android labels Apr 8, 2026

Vignesh-SF3580 marked this pull request as ready for review April 8, 2026 15:09

Copilot AI review requested due to automatic review settings April 8, 2026 15:09

Copilot started reviewing on behalf of Vignesh-SF3580 April 8, 2026 15:11 View session

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sheiksyedm assigned kubaflo Apr 8, 2026

sheiksyedm added this to the .NET 10 SR6 milestone Apr 8, 2026

PureWeen mentioned this pull request Apr 8, 2026

Improve evaluate-pr-tests workflow: pull_request_target, access gating, security docs #34678

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github-actions bot mentioned this pull request Apr 9, 2026

[repo-status] Daily Repo Status - April 9, 2026 🌟 #34893

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Addressed AI concerns.

3673d73

MauiBot added s/agent-approved AI agent recommends approval - PR fix is correct and optimal and removed s/agent-changes-requested AI agent recommends changes - found a better alternative or issues labels Apr 9, 2026

build-analysis bot mentioned this pull request Apr 9, 2026

[net11.0] Screenshot baseline mismatches after main merge (Shell, TabbedPage, Image, Flyout) #34586

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kubaflo previously approved these changes Apr 9, 2026

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kubaflo enabled auto-merge (squash) April 9, 2026 14:21

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kubaflo merged commit a9b817f into dotnet:main Apr 10, 2026
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This was referenced Apr 11, 2026

[repo-status] Daily Repo Status - April 11, 2026 🌟 #34919

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[repo-status] Daily Repo Status - April 12, 2026 🌟 #34922

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Issue Details

Regression Details

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🚦 Gate - Test Before and After Fix

Gate Result: ⚠️ ENV ERROR

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🧪 PR Test Evaluation

PR Test Evaluation Report

Overall Verdict

1. Fix Coverage — ✅

2. Edge Cases & Gaps — ⚠️

3. Test Type Appropriateness — ✅

4. Convention Compliance — ⚠️

5. Flakiness Risk — ⚠️ Medium

6. Duplicate Coverage — ✅ No duplicates

7. Platform Scope — ✅

8. Assertion Quality — ✅

9. Fix-Test Alignment — ✅

Recommendations

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🤖 AI Summary

Key Findings

Fix Candidates

Fix Candidates

Cross-Pollination

Final Recommendation: APPROVE

Phase Status

Summary

Root Cause

Fix Quality

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🤖 AI Summary

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