Should we make LottieBackgroundBehavior.pauseAndRestore the default behavior in Lottie 4.0?

[calda]

We're thinking about releasing Lottie 4.0 later this year, with RenderingEngineOption.automatic enabled by default. This gives us the opportunity to make other improvements that are breaking changes.

I've seen some confusion about AnimationView.backgroundBehavior. It currently defaults to .pause when using the main thread rendering engine, which seems unexpected to many users. For example:

• The animation stops when I navigate to other page and go back #1332
• Animation inside UIPageViewController doesn't play #1565

Also, when using the Core Animation rendering engine, we instead default to .continuePlaying (the CA engine doesn't have any CPU overhead so we don't have to worry about the animation wasting CPU resources animating when hidden). This means the default is inconsistent, which is not ideal.

Should we make .pauseAndRestore the default behavior when using the main thread rendering engine? Curious if anyone has thoughts, and especially if anyone thinks .pause is a better default.

[calda]

We are making this change for Lottie 4.0: #1770