webapi: Improve ResizeObserver#3000
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This gives ResizeObserver a touch up that brings it on par with how the more flushed out IntersectionObserver behaves. While it's impossible to fully implement this in a headless world, we can correctly emit ResizeObserverEntry in a number of important cases, e.g. visibility change, and style width/height changes. Most importantly, we not execute the callback on the initial observe, which can unlock some cases.
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This gives ResizeObserver a touch up that brings it on par with how the more flushed out IntersectionObserver behaves. While it's impossible to fully implement this in a headless world, we can correctly emit ResizeObserverEntry in a number of important cases, e.g. visibility change, and style width/height changes.
Most importantly, we not execute the callback on the initial observe, which can unlock some cases.
This aims to improve the rendering raised in #1507.