Fix infinite loop when setting LottieAnimationView.viewportFrame
#2316
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This PR fixes an issue where
LottieAnimationView
could crash due to an infinite loop ofviewportFrame
was set to a non-nil value. Fixes #2310.This PR adds a test case that validates
viewportFrame
works correctly. We previously didn't have a test case for this, and I didn't even know that flag existed!New test case: