forked from mirrors/gecko-dev
564e92daf3
Automatic update from web-platform-tests LayoutNG: Fix scroll offset clamping in vertical-rl and RTL When a vertical scrollbar in vertical-rl writing-mode or RTL direction disappeared by updating layout, scroll offset could be wrong by scroll offset clamping. This CL fixes it. A LayoutNG block should delay ClampScrollOffsetAfterOverflowChange() calls until it determines the final state of scrollbars existence. So we add a DelayScrollOffsetClampScope to NGBlockNode::Layout(). We should not delay ClampScrollOffsetAfterOverflowChange() called by functions other than PaintLayerScrollableArea::UpdateAfterLayout(). This CL removes the delay capability of ClampScrollOffsetAfterOverflowChange(), and UpdateAfterLayout() calls another delay-capable version of ClampScrollOffsetAfterOverflowChange(). The new behavior is guarded by a runtime flag, and it works as a kill switch just in case. This CL fixes PrintBrowserTest.NoScrollingVerticalRl in browser_tests with LayoutNGView and LayoutNGPrinting flags enabled. Bug: 1294155, 1366268 Change-Id: I9bb8ba80d09adea11dd95c538233720dd06a05e2 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3891818 Reviewed-by: Morten Stenshorne <mstensho@chromium.org> Commit-Queue: Kent Tamura <tkent@chromium.org> Cr-Commit-Position: refs/heads/main@{#1049546} -- wpt-commits: 8b4c96ce705b94499cb9b575bdee76abd5cd06fc wpt-pr: 35923
18 lines
814 B
HTML
18 lines
814 B
HTML
<!DOCTYPE html>
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<link rel="help" href="https://drafts.csswg.org/css-overflow/#scrollbar-layout">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<div id="container" style="width:600px; height:400px; writing-mode:vertical-rl; overflow:auto;">
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<div id="target" style="width:1000px; height:500px; background:lime;"></div>
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</div>
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<script>
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promise_test(async () => {
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await new Promise(resolve => requestAnimationFrame(resolve));
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await new Promise(resolve => requestAnimationFrame(resolve));
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// Remove the vertical scrollbar.
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document.querySelector('#target').style.height = '200px';
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assert_equals(document.querySelector('#container').scrollLeft, 0);
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}, 'Removing the vertical scrollbar of a vertical-rl container should keep scrollLeft');
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</script>
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