Why is it judged that the automatic return to the top is not the latest position after the layout is updated?

[wqhui]

Introduction to autoscrollToTopThreshold in https://reactnative.dev/docs/scrollview#maintainvisiblecontentposition

The optional autoscrollToTopThreshold can be used to make the content automatically scroll to the top after making the adjustment if the user was within the threshold

But I found in the code that the automatic return to the top is implemented after the layout calculation is completed. The ScrollY of the ScrollView will be reset here, but the latest ScrollY value is not used when judging whether to return to the top (the value of isWithinThreshold).

flat-list-mvcp/android/src/main/java/com/mvcpscrollviewmanager/MvcpScrollViewManagerModule.java

Lines 124 to 130 in b9abef4

	int currentScrollY = scrollViewUIHolder.getCurrentScrollY();
	boolean isWithinThreshold = currentScrollY <= autoscrollToTopThreshold;
	scrollView.setScrollY(currentScrollY + deltaY);
	// If the offset WAS within the threshold of the start, animate to the start.
	if (isWithinThreshold) {
	scrollView.smoothScrollTo(scrollView.getScrollX(), 0);
	}

Why is it judged that the automatic return to the top is not the latest position after the layout is updated?

I don’t know if anyone can answer my doubts 🙏 🙏 🙏

Because I found that when the last card changes from a small height to a large height, there is a probability that there will be a constant jitter back to the top.