1657165 - [wpt-sync] Sync PR 24875 - Revert "Reland "Use border box or layout overflow rect for layout shift tracking""

Status: RESOLVED FIXED

(Testing :: web-platform-tests, task, P4)

Description

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Sync web-platform-tests PR 24875 into mozilla-central (this bug is closed when the sync is complete).

PR: https://github.com/web-platform-tests/wpt/pull/24875
Details from upstream follow.

Xianzhu Wang <[e-mail]> wrote:

Revert "Reland "Use border box or layout overflow rect for layout shift tracking""

This reverts commit 84b0d04040453e3f56381655d68909afcc90e6d6.

Reason for revert: Caused crbug.com/1112642.

Original change's description:

Reland "Use border box or layout overflow rect for layout shift tracking"

This reverts commit 491b5a9cbe75eb9cdde6e9e0b21e8246f441b086.

The original CL was reverted because it caused failure on MSAN bots
due to use of uninitialized value.

The reason was that PaintInvalidatorContext::tree_builder_context_
pointed into an PrePaintTreeWalkContext entry in a vector, and the
vector could be reallocated when we added new entries, causing the
pointer in the parent PaintInvalidatorContext to point to an invalid
address.

Now remove PaintInvalidatorContext::tree_builder_context_ and add
PaintInvalidatorContext::transform_ (which was the only used information
from the parent PaintInvalidatorContext) to avoid the problem.

Original change's description:

Revert "Use border box or layout overflow rect for layout shift tracking"

This reverts commit 0933392f84b4bb96466bd86c0e814d96f63ba137.

Reason for revert: ASAN/MSAN failures due to "use of uninitialized value"; see e.g. https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8873209606965810848/+/steps/browser_tests/0/logs/Deterministic_failure:_AllForms__x2f_FormStructureBrowserTest.DataDrivenHeuristics__x2f_148__status_FAILURE_/0

Original change's description:

Use border box or layout overflow rect for layout shift tracking

This CL addresses the following issues of layout shift tracking:

• Changed visual overflows triggered layout shift report
  (originally filed as crbug.com/1090763).
• Descendant layout overflows were not included in ancestor's layout
  shift report.
• Unnecessary descendant layout shift report.
• Slow visual rect calculation for LayoutInline and LayoutText.

It includes the following changes

• Track LayoutBoxes and LayoutTexts only.
• Track both old and new starting points and visual representations
  instead of using location of visual rects as starting points.
• For a LayoutBox, the local visual representation is the layout
  overflow rect if the LayoutBox has layout overflow and doesn't clip
  overflow. Otherwise use the border box rect.
• For a LayoutText, suppose its shift causes shift of all contents
  in containing block logically below the LayoutText, and use that
  part of visual representation of the containing block as the visual
  representation of the shift.
• Map both local starting points and local visual representations to
  the initial containing block and viewport.

This has the following benefits:

• More accurate starting points and visual representations, conforming
  to the specs;
• Better performance by
  • avoiding unnecessary layout shift reports of descendants
  • avoiding slow LayoutInline and LayoutText visual rect calculation.
• sizeof(LayoutObject) is reduced by 16 bytes because now we use the
  previous geometry data in LayoutBoxes for paint invalidation.

Bug: 1108622
Change-Id: I7ebb4e250e7ca2a03b4dadea50034e300e55ad84
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2319538
Reviewed-by: Steve Kobes \<[e-mail]>
Reviewed-by: Koji Ishii \<[e-mail]>
Commit-Queue: Xianzhu Wang \<[e-mail]>
Cr-Commit-Position: refs/heads/master@{#793806}

TBR=[e-mail],[e-mail],[e-mail]

Change-Id: I590f2abc4a48ba65bdfe7a948ffce00b299f9e06
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1108622
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333578
Reviewed-by: Peter Kasting \<[e-mail]>
Commit-Queue: Peter Kasting \<[e-mail]>
Cr-Commit-Position: refs/heads/master@{#793874}

Not skipping CQ checks because this is a reland.

Bug: 1108622
Change-Id: I253a24799b6d2a3af346d4f65e3889217064b035
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333648
Reviewed-by: Philip Rogers \<[e-mail]>
Commit-Queue: Xianzhu Wang \<[e-mail]>
Cr-Commit-Position: refs/heads/master@{#794218}

TBR=[e-mail],[e-mail]

Change-Id: I06c05f8cab6b2cc2ecd3cf3febf930e6eb95f777
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1108622, 1112642
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2336782
Reviewed-by: Xianzhu Wang \<[e-mail]>
Commit-Queue: Xianzhu Wang \<[e-mail]>
Cr-Commit-Position: refs/heads/master@{#794567}

Comment 1

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

PR 24875 applied with additional changes from upstream: 0f1dddc2637431659c0e0a00061c688b0eba661e, 0e4384b535a085db740a733b89bce098d7c700f4, 5111694f4f8d0ae21d4535e53f208d24061411a5

Comment 2

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Pushed to try https://treeherder.mozilla.org/#/jobs?repo=try&revision=e537c736766a562f8f72ee6efbef29154884af8e

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/bfd514221a79
[wpt PR 24875] - Revert "Reland "Use border box or layout overflow rect for layout shift tracking"", a=testonly

Comment 4

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Test result changes from PR not available.

Comment 5

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Test result changes from PR not available.

Comment 6

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/aa913fc4be0e
[wpt PR 24875] - Revert "Reland "Use border box or layout overflow rect for layout shift tracking"", a=testonly

Comment 7

[Razvan Maries]

https://hg.mozilla.org/mozilla-central/rev/aa913fc4be0e