Solving an issue

[mcNets]

I would like to create a new PR related to this issue.

@jeromelaban I think it can be solved by setting the Timelie.State to Stopped at the begining of OnCompleted method of Timeline class, before invoking the _completedHandlers list. I've tried using one of the existing sample apps for Skia and it works, but I can't check all platforms. I had a IOS developer license but I don't have any device right now.

I've made a slightly modification to the ColorAnimation_Background test to show the result.

[jeromelaban]

Thanks for the details! The best way to validate that this works is to create a runtime test, you can find some of those here. That way, it will be executed on CI on all platforms.