LottieOnCompositionLoadedListener is not called when the animation is loaded again

[linkaipeng]

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Checklist

1. Fork this repository into your account. ✅
2. Reproduce your issue in the issue-repro module. Issues without a repro in the issue-repro
   module may be auto-closed. ✅

Link to fork with a repro in the issue-repro module

https://github.com/linkaipeng/lottie-android/tree/master/issue-repro

Describe the bug

Steps To Reproduce
Steps to reproduce the behavior:

1. Call binding.animationView.playAnimation() within the addLottieOnCompositionLoadedListener onCompositionLoaded.
2. Click loadButton, call setAnimation(R.raw.heart), it's work.
3. Click cancelButton, call cancelAnimation()
4. Click loadButton again, it's not work. Reproduce. However, the issue did not exist in the version 6.0.0.

I've reviewed the source code and analyzed the differences with version 6.0.0. I would like to know why these changes were made?

• The setCompositionTask method in LottieAnimationView checks three conditions, and if they are the true, it will return and will not execute the addListener below.
  

• In the cache method of LottieCompositionFactory, a new LottieTask is recreated, but the successListeners within it are empty. Therefore, the onResult inside notifySuccessListeners will not be called.
  

[gpeal]

This is actually the expected behavior here. cancelAnimation() cancels the animator so that if you call playAnimation() again, it'll restart from the beginning but you aren't actually "loading" it again after that.
If you call binding.animationView.setImageDrawable(null) and then all setAnimation(…) again then the callback will get called because it's actually updating the drawable on LottieAnimationView.