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Bug 1583577 [wpt PR 19257] - [LayoutNG] Clear layout results when the layout wasn't successful., a=testonly

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[LayoutNG] Clear layout results when the layout wasn't successful.

Today we can end up in a state where the layout result cache for a
LayoutBox contains a fragment tree which doesn't match the layout tree
state.

This occurs when we "abort" layout, i.e.
1) during the first pass children are positioned at a particular offset
2) a parent aborts layout due to resolving a BFC offset
3) the parent hits the layout result cache which has children at a
   different offset

Bug: 1003558
Change-Id: Iabc5dfefd74c517222ec435cea376ad000a0372f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1821674
Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702507}

--

wpt-commits: eac401e3df87f17e49b38ec2f935fd1177139e23
wpt-pr: 19257
This commit is contained in:
Ian Kilpatrick 2019-10-07 22:05:52 +00:00 committed by moz-wptsync-bot
parent 6c4062337e
commit db13c3bebb
1 changed files with 35 additions and 0 deletions
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35
testing/web-platform/tests/css/CSS2/floats/adjoining-floats-dynamic.html Normal file
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<!DOCTYPE html>
<link rel="match" href="../../reference/ref-filled-green-100px-square.xht">
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1003558">
<style>
#target {
height: 50px;
width: 0;
background: green;
float: right;
}
span {
float: left;
width: 50px;
height: 50px;
background: green;
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div style="display: flow-root; width: 100px; background: red;">
<div id="target"></div>
<div style="position: absolute; width: 50px; height: 50px; background: green;"></div>
<div>
<div style="clear: both; height: 10px;">
<div>
<span></span>
<span></span>
</div>
</div>
</div>
</div>
<script>
document.body.offsetTop;
document.getElementById('target').style.width = '50px';
</script>