perf: skip update from GIF timer if no animated elements are shown #5042
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Currently, when animated elements are turned on, a tick from the GIF timer (50x/s) will always trigger a repaint. This isn't needed.
This PR lays the foundation for more work on selective updates from the GIF timer by tracking elements that contain animations.
After this PR, the GIF timer will only trigger an update if at least one element was animated.