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Use highest priority lane to detect interruptions #21088

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merged 1 commit into from
Mar 25, 2021
Merged

Use highest priority lane to detect interruptions #21088

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11 changes: 6 additions & 5 deletions packages/react-reconciler/src/ReactFiberLane.new.js
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Original file line number Diff line number Diff line change
Expand Up @@ -352,15 +352,16 @@ export function getNextLanes(root: FiberRoot, wipLanes: Lanes): Lanes {
// bother waiting until the root is complete.
(wipLanes & suspendedLanes) === NoLanes
) {
getHighestPriorityLanes(wipLanes);
const wipLanePriority = return_highestLanePriority;
const nextLane = getHighestPriorityLane(nextLanes);
const wipLane = getHighestPriorityLane(wipLanes);
if (
nextLanePriority <= wipLanePriority ||
// Tests whether the next lane is equal or lower priority than the wip
// one. This works because the bits decrease in priority as you go left.
nextLane >= wipLane ||
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Should we use the higherPriorityLane helper?

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Not a huge fan of functions tbh

(Jk (kinda) might have to if/when Lane becomes an opaque type again.)

// Default priority updates should not interrupt transition updates. The
// only difference between default updates and transition updates is that
// default updates do not support refresh transitions.
(nextLanePriority === DefaultLanePriority &&
wipLanePriority === TransitionPriority)
(nextLane === DefaultLane && (wipLane & TransitionLanes) !== NoLanes)
) {
// Keep working on the existing in-progress tree. Do not interrupt.
return wipLanes;
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11 changes: 6 additions & 5 deletions packages/react-reconciler/src/ReactFiberLane.old.js
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -352,15 +352,16 @@ export function getNextLanes(root: FiberRoot, wipLanes: Lanes): Lanes {
// bother waiting until the root is complete.
(wipLanes & suspendedLanes) === NoLanes
) {
getHighestPriorityLanes(wipLanes);
const wipLanePriority = return_highestLanePriority;
const nextLane = getHighestPriorityLane(nextLanes);
const wipLane = getHighestPriorityLane(wipLanes);
if (
nextLanePriority <= wipLanePriority ||
// Tests whether the next lane is equal or lower priority than the wip
// one. This works because the bits decrease in priority as you go left.
nextLane >= wipLane ||
// Default priority updates should not interrupt transition updates. The
// only difference between default updates and transition updates is that
// default updates do not support refresh transitions.
(nextLanePriority === DefaultLanePriority &&
wipLanePriority === TransitionPriority)
(nextLane === DefaultLane && (wipLane & TransitionLanes) !== NoLanes)
) {
// Keep working on the existing in-progress tree. Do not interrupt.
return wipLanes;
Expand Down