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fix: do not show Transition fallback on 2nd change if 1st change resolved synchronously (closes #4492, closes #3868) (#4495)

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Greg Johnston
2025-12-19 10:42:44 -05:00
committed by GitHub
parent 8f5c34de8a
commit 65940cbefa
13 changed files with 280 additions and 29 deletions
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27
reactive_graph/src/computed/async_derived/arc_async_derived.rs
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@@ -632,12 +632,29 @@ impl<T: 'static> ReadUntracked for ArcAsyncDerived<T> {
fn try_read_untracked(&self) -> Option<Self::Value> {
if let Some(suspense_context) = use_context::<SuspenseContext>() {
// create a handle to register it with suspense
let handle = suspense_context.task_id();
let ready = SpecialNonReactiveFuture::new(self.ready());
crate::spawn(async move {
ready.await;
drop(handle);
});
// check if the task is *already* ready
let mut ready =
Box::pin(SpecialNonReactiveFuture::new(self.ready()));
match ready.as_mut().now_or_never() {
Some(_) => {
// if it's already ready, drop the handle immediately
// this will immediately notify the suspense context that it's complete
drop(handle);
}
None => {
// otherwise, spawn a task to wait for it to be ready, then drop the handle,
// which will notify the suspense
crate::spawn(async move {
ready.await;
drop(handle);
});
}
}
// register the suspense context with our list of them, to be notified later if this re-runs
self.inner
.write()
.or_poisoned()