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[iOS] Fix ArgumentOutOfRangeException in ObservableGroupedSource when removing a group from grouped CollectionView #34692

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Fix test build: use Controller.CollectionView for NumberOfSections

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[iOS] Fix ArgumentOutOfRangeException in ObservableGroupedSource when removing a group from grouped CollectionView #34692

Fix test build: use Controller.CollectionView for NumberOfSections
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Build Analysis / Build Analysis failed May 13, 2026 in 0s

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Build Failures

maui-pr-uitests / Android UITests / Controls (API 30) / Controls (API 30) CollectionView / Publish the android_ui_tests_controls_30 test results

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    ❌There are one or more test failures detected in result files. Detailed summary of published test results can be viewed in the Tests tab.

maui-pr-uitests / macOS UITests / Controls / Controls CollectionView / Publish the mac_ui_tests_controls test results

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    ❌There are one or more test failures detected in result files. Detailed summary of published test results can be viewed in the Tests tab.

maui-pr-uitests / macOS UITests / Controls / Controls Layout / Publish the mac_ui_tests_controls test results

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    ❌There are one or more test failures detected in result files. Detailed summary of published test results can be viewed in the Tests tab.

2 other jobs are failing and were not displayed due to space limitations.
Builds with failures: [maui-pr-uitests] [maui-pr-devicetests]

Test Failures (19 tests failed)

🔹 [All failing tests from maui-pr-devicetests]

    ⚠️ 11 failing tests not displayed for this pipeline due to space limitations

    ❌ Controls Tests.WorkItemExecution [Console] [Details] [Artifacts] [24.87% failure rate]
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    This is a helix work item crash with status: BadExit. To investigate look the [Console log] / navigate to [Helix Artifacts]

    Failing Configurations (2)
    ❌ Controls.DeviceTests-CollectionView.WorkItemExecution [Console] [Details] [Artifacts] [1.13% failure rate]
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    This is a helix work item crash with status: BadExit. To investigate look the [Console log] / navigate to [Helix Artifacts]

    Failing Configurations (2)
    ❌ Removing all sections one by one from grouped CollectionView does not crash (Handler2) [Console] [Details] [Artifacts] [100.00% failure rate]
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    Failing Configurations (4)
    Exception Message
    System.Exception : I can't work with Microsoft.Maui.Controls.Handlers.Items2.CollectionViewHandler2
    CallStack
       at Microsoft.Maui.DeviceTests.ControlsHandlerTestBase.<>c__DisplayClass17_1`1.<<CreateHandlerAndAddToWindow>b__1>d[[Microsoft.Maui.Controls.Handlers.Items2.CollectionViewHandler2, Microsoft.Maui.Controls, Version=10.0.0.0, Culture=neutral, PublicKeyToken=null]].MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.Maui.DeviceTests.ControlsHandlerTestBase.<>c__DisplayClass31_0`1.<<SetupWindowForTests>b__0>d[[Microsoft.Maui.Controls.Handlers.Items2.CollectionViewHandler2, Microsoft.Maui.Controls, Version=10.0.0.0, Culture=neutral, PublicKeyToken=null]].MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.Maui.DeviceTests.ControlsHandlerTestBase.<>c__DisplayClass31_0`1.<<SetupWindowForTests>b__0>d[[Microsoft.Maui.Controls.Handlers.Items2.CollectionViewHandler2, Microsoft.Maui.Controls, Version=10.0.0.0, Culture=neutral, PublicKeyToken=null]].MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.Maui.Dispatching.DispatcherExtensions.<>c__DisplayClass3_0.<<DispatchAsync>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.Maui.Dispatching.DispatcherExtensions.<>c__DisplayClass2_0`1.<<DispatchAsync>b__0>d[[System.Boolean, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.Maui.DeviceTests.ControlsHandlerTestBase.<>c__DisplayClass17_0`1.<<CreateHandlerAndAddToWindow>b__0>d[[Microsoft.Maui.Controls.Handlers.Items2.CollectionViewHandler2, Microsoft.Maui.Controls, Version=10.0.0.0, Culture=neutral, PublicKeyToken=null]].MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.Maui.Dispatching.DispatcherExtensions.<>c__DisplayClass3_0.<<DispatchAsync>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.Maui.Dispatching.DispatcherExtensions.<>c__DisplayClass2_0`1.<<DispatchAsync>b__0>d[[System.Boolean, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.Maui.DeviceTests.CollectionViewTests.ItemsSourceGroupedRemoveAllSectionsOneByOneDoesNotCrash()
--- End of stack trace from previous location ---
    ❌ Removing first section from grouped CollectionView does not crash (Handler2) [Console] [Details] [Artifacts] [100.00% failure rate]
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    Failing Configurations (4)
    Exception Message
    System.Exception : I can't work with Microsoft.Maui.Controls.Handlers.Items2.CollectionViewHandler2
    CallStack
       at Microsoft.Maui.DeviceTests.ControlsHandlerTestBase.<>c__DisplayClass17_1`1.<<CreateHandlerAndAddToWindow>b__1>d[[Microsoft.Maui.Controls.Handlers.Items2.CollectionViewHandler2, Microsoft.Maui.Controls, Version=10.0.0.0, Culture=neutral, PublicKeyToken=null]].MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.Maui.DeviceTests.ControlsHandlerTestBase.<>c__DisplayClass31_0`1.<<SetupWindowForTests>b__0>d[[Microsoft.Maui.Controls.Handlers.Items2.CollectionViewHandler2, Microsoft.Maui.Controls, Version=10.0.0.0, Culture=neutral, PublicKeyToken=null]].MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.Maui.DeviceTests.ControlsHandlerTestBase.<>c__DisplayClass31_0`1.<<SetupWindowForTests>b__0>d[[Microsoft.Maui.Controls.Handlers.Items2.CollectionViewHandler2, Microsoft.Maui.Controls, Version=10.0.0.0, Culture=neutral, PublicKeyToken=null]].MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.Maui.Dispatching.DispatcherExtensions.<>c__DisplayClass3_0.<<DispatchAsync>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.Maui.Dispatching.DispatcherExtensions.<>c__DisplayClass2_0`1.<<DispatchAsync>b__0>d[[System.Boolean, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.Maui.DeviceTests.ControlsHandlerTestBase.<>c__DisplayClass17_0`1.<<CreateHandlerAndAddToWindow>b__0>d[[Microsoft.Maui.Controls.Handlers.Items2.CollectionViewHandler2, Microsoft.Maui.Controls, Version=10.0.0.0, Culture=neutral, PublicKeyToken=null]].MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.Maui.Dispatching.DispatcherExtensions.<>c__DisplayClass3_0.<<DispatchAsync>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.Maui.Dispatching.DispatcherExtensions.<>c__DisplayClass2_0`1.<<DispatchAsync>b__0>d[[System.Boolean, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.Maui.DeviceTests.CollectionViewTests.ItemsSourceGroupedRemoveFirstSectionDoesNotCrash()
--- End of stack trace from previous location ---
    ❌ Removing last section from grouped CollectionView does not crash (Handler2) [Console] [Details] [Artifacts] [100.00% failure rate]
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    Failing Configurations (4)
    Exception Message
    System.Exception : I can't work with Microsoft.Maui.Controls.Handlers.Items2.CollectionViewHandler2
    CallStack
       at Microsoft.Maui.DeviceTests.ControlsHandlerTestBase.<>c__DisplayClass17_1`1.<<CreateHandlerAndAddToWindow>b__1>d[[Microsoft.Maui.Controls.Handlers.Items2.CollectionViewHandler2, Microsoft.Maui.Controls, Version=10.0.0.0, Culture=neutral, PublicKeyToken=null]].MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.Maui.DeviceTests.ControlsHandlerTestBase.<>c__DisplayClass31_0`1.<<SetupWindowForTests>b__0>d[[Microsoft.Maui.Controls.Handlers.Items2.CollectionViewHandler2, Microsoft.Maui.Controls, Version=10.0.0.0, Culture=neutral, PublicKeyToken=null]].MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.Maui.DeviceTests.ControlsHandlerTestBase.<>c__DisplayClass31_0`1.<<SetupWindowForTests>b__0>d[[Microsoft.Maui.Controls.Handlers.Items2.CollectionViewHandler2, Microsoft.Maui.Controls, Version=10.0.0.0, Culture=neutral, PublicKeyToken=null]].MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.Maui.Dispatching.DispatcherExtensions.<>c__DisplayClass3_0.<<DispatchAsync>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.Maui.Dispatching.DispatcherExtensions.<>c__DisplayClass2_0`1.<<DispatchAsync>b__0>d[[System.Boolean, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.Maui.DeviceTests.ControlsHandlerTestBase.<>c__DisplayClass17_0`1.<<CreateHandlerAndAddToWindow>b__0>d[[Microsoft.Maui.Controls.Handlers.Items2.CollectionViewHandler2, Microsoft.Maui.Controls, Version=10.0.0.0, Culture=neutral, PublicKeyToken=null]].MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.Maui.Dispatching.DispatcherExtensions.<>c__DisplayClass3_0.<<DispatchAsync>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.Maui.Dispatching.DispatcherExtensions.<>c__DisplayClass2_0`1.<<DispatchAsync>b__0>d[[System.Boolean, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.Maui.DeviceTests.CollectionViewTests.ItemsSourceGroupedRemoveLastSectionDoesNotCrash()
--- End of stack trace from previous location ---

🔹 [All failing tests from maui-pr-uitests]

    ⚠️ 3 failing tests not displayed for this pipeline due to space limitations

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