Net: shutdown async runtime on exit
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Shutting down the async runtime as part of exiting the core resource thread.
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This is based on compiling with `RUSTFLAGS="-W unused_crate_dependencies"` (CC https://github.com/rust-lang/rust/pull/72342) in a recent Nightly (more so than used in the tree as of this writing, CC https://github.com/servo/servo/issues/26661 for work-arounds).
Only one crate is actually removed from the dependency graph, others are still dependended from other places.
The image cache returns an `ImageCacheResult::ImageAvailable `the second
time you try getting the placeholder. This means that in some cases, the
loading of an image would fail, then the same image would get fetched
from the cache, the placeholder would be loaded from that but would be
seen as a normal image, firing a load event.
This made the tests in
`fetch/cross-origin-resource-policy/image-loads.html` fail depending on
their order.
Have animations more closely match the HTML spec
These two commits do two major things:
**Have animations ticks trigger a restyle**: This corrects synchronization issues with animations,
where the values used in layout are out of sync with what is returned by `getComputedStyle`.
**Tick the animation timer in script according to spec**: This greatly reduces the flakiness of
animation and transitions tests.
Fixes#13865.
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- [ ] These changes fix#13865
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This doesn't change any expectation because we're not setting
response.redirected properly so all the tests fail later on when it's
asserted to be true.
Fixes#25257
This change corrects synchronization issues with animations, by
reworking the animation processing model to do a quick restyle and
incremental layout when ticking animations.
While this change adds overhead to animation ticks, the idea is that
this will be the fallback when synchronous behavior is required to
fulfill specification requirements. In the optimistic case, many
animations could be updated and applied off-the-main-thread and then
resynchronized when style information is queried by script.
Fixes#13865.
