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Andrew Clark
bd7f4a013b
* Warn if `finishedLanes` is empty in commit phase See #21233 for context. * Fix sloppy factoring when assigning finishedLanes `finishedLanes` is assigned in `performSyncWorkOnRoot` and `performSyncWorkOnRoot`. It's meant to represent whichever lanes we used to render, but because of some sloppy factoring, it can sometimes equal `NoLanes`. The fixes are: - Always check if the lanes are not `NoLanes` before entering the work loop. There was a branch where this wasn't always true. - In `performSyncWorkOnRoot`, don't assume the next lanes are sync; the priority may have changed, or they may have been flushed by a previous task. - Don't re-assign the `lanes` variable (the one that gets assigned to `finishedLanes` until right before we enter the work loop, so that it is always corresponds to the newest complete root.