[BUG] Multiple Unloaded events in WinUI causes empty SKXamlCanvas

[Mangepange]

Description

I'm displaying different SKXamlCanvas controls in separate WinUI TabView tabs. When I remove multiple tabs, the currently selected tab drops its rendered content. I found that this is really a WinUI issue, microsoft/microsoft-ui-xaml#9880, where multiple Unloaded events are triggered on the wrong FrameworkElement. In the SKXamlCanvas code I can see that the backgound is cleared on Unloaded events, so that's why my content disappears. I also found my way to #1118 where you seem to have fixed a somewhat related issue.

It seems like WinUI has an erratic Load/Unload behavior in other circumstances as well, and that you maybe cannot rely on them coming in correct order.
microsoft/microsoft-ui-xaml#1900
microsoft/microsoft-ui-xaml#8342

When debugging this, I noticed that when the SKXamlCanvas recieves incorrect Unloaded events it actually has IsLoaded == true. Maybe the current fix with the loadUnloadCounter could be replaced with a private isLoaded flag which can be set in OnLoaded, and then prevent multiple Loaded events to be processed? The flag should then only get reset in OnUnloaded if IsLoaded actually is false.

Code

See microsoft/microsoft-ui-xaml#9880

Expected Behavior

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Actual Behavior

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Version of SkiaSharp

2.88.3 (Current)

Last Known Good Version of SkiaSharp

Other (Please indicate in the description)

IDE / Editor

Visual Studio (Windows)

Platform / Operating System

Windows

Platform / Operating System Version

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Devices

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Relevant Screenshots

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Relevant Log Output

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Code of Conduct

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