[leak-fix] Fix GradientBrush.GradientStops memory leak (Fixes #36363) - #36521

❌10.0.100-ci+pr.36521.azdo.1511373 / macOS UITests / Controls / Controls Layout and 1 more hits - slow macOS - "##[error]The job running on agent Azure Pipelines 9 ran longer than the maximum time of 60 minutes."

❌10.0.100-ci+pr.36521.azdo.1511373 / macOS UITests / Controls / Controls Layout / Controls Layout and 1 more hits - The Operation will be canceled. The next steps may not contain expected logs.

maui-pr-uitests / Android UITests / Controls (API 30) / Controls (API 30) Border,BoxView,Brush,Button / Controls (API 30) Border,BoxView,Brush,Button

❌PowerShell exited with code '1'.

maui-pr-uitests / Android UITests / Controls (API 30) / Controls (API 30) Border,BoxView,Brush,Button / Publish the android_ui_tests_controls_30 test results

❌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 / Android UITests / Controls (API 30) / Controls (API 30) Image,ImageButton,IndicatorView,InputTransparent,IsEnabled,IsVisible / Controls (API 30) Image,ImageButton,IndicatorView,InputTransparent,IsEnabled,IsVisible

❌PowerShell exited with code '1'.

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

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

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

❌ Microsoft.Maui.TestCases.Tests.AbsoluteLayoutFeatureTests(Android).VerifyAbsoluteLayout_Reset_LayoutBounds [Details] [1.77% failure rate]

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Failing Configuration

• Layout_android_ui_tests_controls_30

Exception Message

OpenQA.Selenium.UnknownErrorException : An unknown server-side error occurred while processing the command. Original error: Could not proxy command to the remote server. Original error: socket hang up

CallStack

   at OpenQA.Selenium.WebDriver.UnpackAndThrowOnError(Response errorResponse, String commandToExecute)
   at OpenQA.Selenium.WebDriver.ExecuteAsync(String driverCommandToExecute, Dictionary`2 parameters)
   at OpenQA.Selenium.WebDriver.Execute(String driverCommandToExecute, Dictionary`2 parameters)
   at OpenQA.Selenium.WebDriver.FindElements(String mechanism, String value)
   at OpenQA.Selenium.By.<.ctor>b__11_1(ISearchContext context)
   at OpenQA.Selenium.By.FindElements(ISearchContext context)
   at OpenQA.Selenium.Appium.AppiumDriver.FindElements(By by)
   at UITest.Appium.AppiumQuery.FindElement(AppiumApp appiumApp) in /_/src/TestUtils/src/UITest.Appium/AppiumQuery.cs:line 97
   at UITest.Appium.AppiumApp.FindElementByText(String text) in /_/src/TestUtils/src/UITest.Appium/AppiumApp.cs:line 95
   at UITest.Appium.HelperExtensions.FindElement(IApp app, String element) in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 2798
   at UITest.Appium.HelperExtensions.<>c__DisplayClass55_0.<WaitForElement>g__result|0() in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 792
   at UITest.Appium.HelperExtensions.Wait(Func`1 query, Func`2 satisfactory, String timeoutMessage, Nullable`1 timeout, Nullable`1 retryFrequency) in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 2748
   at UITest.Appium.HelperExtensions.WaitForAtLeastOne(Func`1 query, String timeoutMessage, Nullable`1 timeout, Nullable`1 retryFrequency) in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 2784
   at UITest.Appium.HelperExtensions.WaitForElement(IApp app, String marked, String timeoutMessage, Nullable`1 timeout, Nullable`1 retryFrequency, Nullable`1 postTimeout) in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 793
   at Microsoft.Maui.TestCases.Tests.AbsoluteLayoutFeatureTests.VerifyAbsoluteLayout_Reset_LayoutBounds() in /_/src/Controls/tests/TestCases.Shared.Tests/Tests/FeatureMatrix/AbsoluteLayoutFeatureTests.cs:line 370
   at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(Object obj, IntPtr* args)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)

❌ Microsoft.Maui.TestCases.Tests.IndicatorViewFeatureTests(Android).VerifyIndicatorView_Position [Details] [0.60% failure rate]

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Failing Configuration

• Image,ImageButton,IndicatorView,InputTransparent,IsEnabled,IsVisible_android_ui_tests_controls_30

Exception Message

OpenQA.Selenium.StaleElementReferenceException : Cached elements 'By.id: com.microsoft.maui.uitests:id/PositionLabel' do not exist in DOM anymore; For documentation on this error, please visit: https://www.selenium.dev/documentation/webdriver/troubleshooting/errors#stale-element-reference-exception

CallStack

   at OpenQA.Selenium.WebDriver.UnpackAndThrowOnError(Response errorResponse, String commandToExecute)
   at OpenQA.Selenium.WebDriver.ExecuteAsync(String driverCommandToExecute, Dictionary`2 parameters)
   at OpenQA.Selenium.WebElement.Execute(String commandToExecute, Dictionary`2 parameters)
   at OpenQA.Selenium.WebElement.get_Text()
   at OpenQA.Selenium.Appium.AppiumElement.<get_Text>b__8_0()
   at OpenQA.Selenium.Appium.AppiumElement.CacheValue(String key, Func`1 getter)
   at OpenQA.Selenium.Appium.AppiumElement.get_Text()
   at UITest.Appium.AppiumTextActions.GetText(IDictionary`2 parameters) in /_/src/TestUtils/src/UITest.Appium/Actions/AppiumTextActions.cs:line 39
   at UITest.Appium.AppiumTextActions.Execute(String commandName, IDictionary`2 parameters) in /_/src/TestUtils/src/UITest.Appium/Actions/AppiumTextActions.cs:line 31
   at UITest.Appium.AppiumCommandExecutor.Execute(String commandName, IDictionary`2 parameters) in /_/src/TestUtils/src/UITest.Appium/Actions/AppiumCommandExecutor.cs:line 20
   at UITest.Appium.HelperExtensions.<>c__DisplayClass9_0.<GetText>b__0() in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 126
   at System.Threading.Tasks.Task`1.InnerInvoke()
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
--- End of stack trace from previous location ---
   at UITest.Appium.HelperExtensions.RunWithTimeout[T](Func`1 action, Nullable`1 timeout) in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 3063
   at UITest.Appium.HelperExtensions.GetText(IUIElement element) in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 124
   at Microsoft.Maui.TestCases.Tests.IndicatorViewFeatureTests.VerifyIndicatorView_Position() in /_/src/Controls/tests/TestCases.Shared.Tests/Tests/FeatureMatrix/IndicatorViewFeatureTests.cs:line 94
   at System.RuntimeMethodHandle.InvokeMethod(ObjectHandleOnStack target, Void** arguments, ObjectHandleOnStack sig, BOOL isConstructor, ObjectHandleOnStack result)
   at System.RuntimeMethodHandle.InvokeMethod(ObjectHandleOnStack target, Void** arguments, ObjectHandleOnStack sig, BOOL isConstructor, ObjectHandleOnStack result)
   at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(Object obj, IntPtr* args)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)

❌ Microsoft.Maui.TestCases.Tests.Issues.Issue12060(Mac).AcceptedOperationNoneDisablesDropOperation [Details] [0.42% failure rate]

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Failing Configuration

• Cells,CheckBox,ContextActions,CustomRenderers,DatePicker,Dispatcher,DisplayAlert,DisplayPrompt,DragAndDrop_mac_ui_tests_controls

Exception Message

System.TimeoutException : Timed out waiting for element...

CallStack

   at UITest.Appium.HelperExtensions.Wait(Func`1 query, Func`2 satisfactory, String timeoutMessage, Nullable`1 timeout, Nullable`1 retryFrequency) in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 2757
   at UITest.Appium.HelperExtensions.WaitForElement(IApp app, String marked, String timeoutMessage, Nullable`1 timeout, Nullable`1 retryFrequency, Nullable`1 postTimeout) in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 795
   at Microsoft.Maui.TestCases.Tests.Issues.Issue12060.AcceptedOperationNoneDisablesDropOperation() in /_/src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue12060.cs:line 24
   at System.RuntimeMethodHandle.InvokeMethod(ObjectHandleOnStack target, Void** arguments, ObjectHandleOnStack sig, BOOL isConstructor, ObjectHandleOnStack result)
   at System.RuntimeMethodHandle.InvokeMethod(ObjectHandleOnStack target, Void** arguments, ObjectHandleOnStack sig, BOOL isConstructor, ObjectHandleOnStack result)
   at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(Object obj, IntPtr* args)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)

❌ Microsoft.Maui.TestCases.Tests.Issues.Issue22306(Android).ButtonsLayoutResolveWhenParentSizeChanges [Details] [4.31% failure rate]

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Failing Configuration

• Border,BoxView,Brush,Button_android_ui_tests_controls_30

Exception Message

VisualTestUtils.VisualTestFailedException : 
Snapshot different than baseline: ButtonsLayoutResolveWhenParentSizeChangesOriginal2.png (1.85% difference)
If the correct baseline has changed (this isn't a a bug), then update the baseline image.
See test attachment or download the build artifacts to get the new snapshot file.
More info: https://aka.ms/visual-test-workflow

CallStack

   at Microsoft.Maui.TestCases.Tests.UITest.VerifyScreenshot(String name, Nullable`1 retryDelay, Nullable`1 retryTimeout, Int32 cropLeft, Int32 cropRight, Int32 cropTop, Int32 cropBottom, Double tolerance) in /_/src/Controls/tests/TestCases.Shared.Tests/UITest.cs:line 296
   at Microsoft.Maui.TestCases.Tests.Issues.Issue22306.ButtonsLayoutResolveWhenParentSizeChanges() in /_/src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue22306.cs:line 49
   at System.RuntimeMethodHandle.InvokeMethod(ObjectHandleOnStack target, Void** arguments, ObjectHandleOnStack sig, BOOL isConstructor, ObjectHandleOnStack result)
   at System.RuntimeMethodHandle.InvokeMethod(ObjectHandleOnStack target, Void** arguments, ObjectHandleOnStack sig, BOOL isConstructor, ObjectHandleOnStack result)
   at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(Object obj, IntPtr* args)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)

❌ Microsoft.Maui.TestCases.Tests.Issues.Issue24996(Mac).ChangingTranslationShouldNotCauseLayoutPassOnAncestors [Details] [3.92% failure rate]

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Failing Configuration

• Layout_mac_ui_tests_controls

Exception Message

  Assert.That(condition, Is.True)
  Expected: True
  But was:  False

CallStack

   at NUnit.Framework.Legacy.ClassicAssert.True(Boolean condition)
   at Microsoft.Maui.TestCases.Tests.Issues.Issue24996.ChangingTranslationShouldNotCauseLayoutPassOnAncestors() in /_/src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue24996.cs:line 27
1)    at NUnit.Framework.Legacy.ClassicAssert.True(Boolean condition)

at Microsoft.Maui.TestCases.Tests.Issues.Issue24996.ChangingTranslationShouldNotCauseLayoutPassOnAncestors() in /_/src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue24996.cs:line 27