commit | 8b4c96ce705b94499cb9b575bdee76abd5cd06fc | [log] [tgz] |
---|---|---|
author | Kent Tamura <tkent@chromium.org> | Wed Sep 21 09:43:09 2022 |
committer | Blink WPT Bot <blink-w3c-test-autoroller@chromium.org> | Wed Sep 21 09:52:26 2022 |
tree | dd0a0dbaef3889132370ab9b39a35cbe4ca1a603 | |
parent | 0865ba27228c2560fdd8601d2cd53537554ad50b [diff] |
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}
The web-platform-tests Project is a cross-browser test suite for the Web-platform stack. Writing tests in a way that allows them to be run in all browsers gives browser projects confidence that they are shipping software that is compatible with other implementations, and that later implementations will be compatible with their implementations. This in turn gives Web authors/developers confidence that they can actually rely on the Web platform to deliver on the promise of working across browsers and devices without needing extra layers of abstraction to paper over the gaps left by specification editors and implementors.
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