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fix: scrolling can be incorrect when fast-forwarding (#1352)

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* fix: scrolling can be incorrect when fast-forwarding

* add test case

* add changeset and remove duplicate diffProps process

---------

Co-authored-by: Yun Feng <yun.feng0817@gmail.com>
This commit is contained in:
juliecheng
2026-04-01 12:00:00 +08:00
committed by GitHub
parent 3f4bf14dfb
commit 3da2652950
4 changed files with 387 additions and 3 deletions
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13
packages/rrdom/src/diff.ts
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@@ -118,7 +118,7 @@ export function diff(
diffChildren(oldTree, newTree, replayer, rrnodeMirror);
diffAfterUpdatingChildren(oldTree, newTree, replayer, rrnodeMirror);
diffAfterUpdatingChildren(oldTree, newTree, replayer);
}
/**
@@ -194,6 +194,15 @@ function diffBeforeUpdatingChildren(
rrnodeMirror,
);
}
/**
* Attributes and styles of the old element need to be updated before updating its children because of an edge case:
* `applyScroll` may fail in `diffAfterUpdatingChildren` when the height of a node when `applyScroll` is called may be incorrect if
* 1. its parent node contains styles that affects the targeted node's height
* 2. the CSS selector is targeting an attribute of the parent node
* by running `diffProps` on the parent node before `diffChildren` is called,
* we can ensure that the correct attributes (and therefore styles) have applied to parent nodes
*/
diffProps(oldElement, newRRElement, rrnodeMirror);
break;
}
}
@@ -207,7 +216,6 @@ function diffAfterUpdatingChildren(
oldTree: Node,
newTree: IRRNode,
replayer: ReplayerHandler,
rrnodeMirror: Mirror,
) {
switch (newTree.RRNodeType) {
case RRNodeType.Document: {
@@ -218,7 +226,6 @@ function diffAfterUpdatingChildren(
case RRNodeType.Element: {
const oldElement = oldTree as HTMLElement;
const newRRElement = newTree as RRElement;
diffProps(oldElement, newRRElement, rrnodeMirror);
newRRElement.scrollData &&
replayer.applyScroll(newRRElement.scrollData, true);
/**