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Bug 1684554 [wpt PR 27019] - [LayoutNG] Fix OOF not painted in "tall" multicolumns, a=testonly

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[LayoutNG] Fix OOF not painted in "tall" multicolumns

In some cases as the one described in https://crbug.com/1151383,
non-fragmented OOF are not painted. The computed |offset_from_root|
seems to be invalid and this CL fixes it.

Bug: 1151383
Change-Id: Ib85440577442782a1f09f704d2224214d4822232
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2607670
Commit-Queue: Benjamin Beaudry <benjamin.beaudry@microsoft.com>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841740}

--

wpt-commits: 1affd0458528e1ccde884f4e4c942da7d056856b
wpt-pr: 27019
This commit is contained in:
Benjamin Beaudry 2021-01-09 09:38:28 +00:00 committed by moz-wptsync-bot
parent d4218127ef
commit 149a35615c
2 changed files with 42 additions and 0 deletions
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10
testing/web-platform/tests/css/css-break/out-of-flow-in-multicolumn-014-ref.html Normal file
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@ -0,0 +1,10 @@
<!DOCTYPE html>
<style>
div {
height: 300px;
width: 300px;
background-color: green;
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div></div>

32
testing/web-platform/tests/css/css-break/out-of-flow-in-multicolumn-014.html Normal file
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<!DOCTYPE html>
<link rel="help" href="https://www.w3.org/TR/css-position-3/#abspos-breaking">
<!-- This test requires a 300px tall multicolumn to reproduce the issue. -->
<link rel="match" href="out-of-flow-in-multicolumn-014-ref.html">
<!-- Fragmented OOF element with block-size percentage resolution and overflow. -->
<style>
#multicol {
columns: 2;
width: 300px;
height: 300px;
column-fill: auto;
column-gap: 0px;
background-color: red;
}
.rel {
position: relative;
}
.abs {
position: absolute;
top: 0px;
width: 150px;
height: 150px;
background: green;
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div id="multicol">
<div style="width: 150px; height: 450px; background-color: green;"></div>
<div class="rel">
<div class="abs"></div>
</div>
</div>