Fix AnimationCompleted event not firing with EventToCommandBehavior

[Copilot]

SKLottieView.AnimationCompleted event fails to trigger when used with EventToCommandBehavior in MVVM scenarios:

<skia:SKLottieView Source="wait.json">
    <skia:SKLottieView.Behaviors>
        <toolkit:EventToCommandBehavior
            Command="{Binding NavigateCommand}"
            EventName="AnimationCompleted" />
    </skia:SKLottieView.Behaviors>
</skia:SKLottieView>

Changes

• Async event dispatch: Wrap event invocation in Dispatcher.Dispatch() to avoid conflicts when handlers perform UI operations during property change notifications
• Single-fire guarantee: Add animationCompletedFired flag to ensure event fires once per completion, reset on animation restart/repeat/reload
• Test infrastructure: Update SKLottieViewTest to inherit from DispatchingBaseTest for mock dispatcher support

Implementation

// Before
if (IsComplete)
    AnimationCompleted?.Invoke(this, EventArgs.Empty);

// After  
if (IsComplete && !animationCompletedFired)
{
    animationCompletedFired = true;
    Dispatcher.Dispatch(() => AnimationCompleted?.Invoke(this, EventArgs.Empty));
}

Warning

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  • Triggering command: /usr/bin/dotnet dotnet workload install maui-android (dns block)
• pdfvsblobprodcus380.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet restore --no-dependencies /home/REDACTED/work/SkiaSharp.Extended/.codeql-scratch/dbs/csharp/working/91EEECFC80ED8D6FF706082129E4975F/missingpackages_workingdir --packages /home/REDACTED/work/SkiaSharp.Extended/.codeql-scratch/dbs/csharp/working/missingpackages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal --configfile /home/REDACTED/work/SkiaSharp.Extended/.codeql-scratch/dbs/csharp/working/nugetconfig/nuget.config --force (dns block)
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Original prompt

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This section details on the original issue you should resolve

<issue_title>[BUG] Lotie Animation Completed does not work</issue_title>
<issue_description>Description

I am using mvvm to navigate when the animation is completed and does not work

Code

<skia:SKLottieView AnimationCompleted="SKLottieView_AnimationCompleted" Source="wait.json"> <skia:SKLottieView.Behaviors> <toolkit:EventToCommandBehavior Command="{Binding CheckAuthCommand}" EventName="AnimationCompleted" /> </skia:SKLottieView.Behaviors>

`public partial class WelcomePageViewModel : ObservableObject {

[RelayCommand]
async Task CheckAuth() {
    await Shell.Current.GoToAsync($"//{nameof(LoginPage)}");
}

}
`

Expected Behavior

To be able no navigate

Actual Behavior

does not trigger

Basic Information

VS 2022
.Net 9
Android
Lotie package 2.0

Detailed IDE/OS information (click to expand)

PASTE ANY DETAILED VERSION INFO HERE

2.0.0

Screenshots

Reproduction Link

https://github.com/eduardoagr/MauiSamples

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [BUG] Lotie Animation Completed does not work #310

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