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Regression : Unwanted contents are observed on the left border of scrollbar, while scrolling the list.
Reported by
yfulgaon...@etouch.net,
Feb 15 2017
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Issue descriptionChrome Version : 57.0.2987.54 (Official Build) e483b047ce7b13ffee6f490358cc7973a12599de-refs/branch-heads/2987@{#516} 32/64 bit OS : Windows (7,8,10) Test URL : http://www.gamestop.com/stores What steps will reproduce the problem? 1. Launch chrome and navigate to above URL. 2. Drag down the scrollbar of 'Store Details' list and observe the left border of scrollbar (kindly review an attached screen cast). Actual : Unwanted background contents are observed on the left border of scrollbar, while scrolling the list. Expected : Background contents should not appear on the border of scrollbar while scrolling the 'Store Details' list. This is a regression issue broken in ‘M-57’, below is the Manual Regression range and will soon update other info. Good build : 57.0.2937.0 Bad build : 57.0.2938.0 Note : This is Windows OS specific issue and the same is working fine on Mac & Linux OS.
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Feb 15 2017
Unable to reproduce but looks like a paint invalidation issue. Over to paint for further triage.
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Feb 16 2017
Narrow Bisect info : https://chromium.googlesource.com/chromium/src/+log/ec34ad1ad06512ce1788542299cc8823919d415b..91a93770c4d935af7923428b7c00c39f988ee541?pretty=fuller&n=10000 Suspecting : r435280 from Narrow Bisect @flackr : Please take a look.
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Mar 2 2017
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Apr 28 2017
As asked on the code review, what's the status? Regardless, I don't think this is a P1 because web functionality is not lost and it's not too ugly.
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May 20 2017
After some discussion with Chris we decided that we should be constructing the composited layers to match the subpixel accumulated snapping. I've uploaded a new patch for review at https://chromium-review.googlesource.com/c/509175/.
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Jun 2 2017
The following revision refers to this bug: https://chromium.googlesource.com/chromium/src.git/+/b71f6a8eed67fb326ac00d673c810d0a053ad048 commit b71f6a8eed67fb326ac00d673c810d0a053ad048 Author: Robert Flack <flackr@chromium.org> Date: Fri Jun 02 02:56:38 2017 Account for subpixel accumulation in pixel snapped border box size. The subpixel accumulation can affect the pixel snapped border box size of a paint layer. Take this into account when positioning or sizing for this box's PaintLayer. Bug: 692486 Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2 Change-Id: I16f78d7105cd9e069d1de563ed81fd09245c1b35 Reviewed-on: https://chromium-review.googlesource.com/509175 Reviewed-by: Tien-Ren Chen <trchen@chromium.org> Reviewed-by: Chris harrelson <chrishtr@chromium.org> Reviewed-by: Peter Mayo <petermayo@chromium.org> Commit-Queue: Robert Flack <flackr@chromium.org> Cr-Commit-Position: refs/heads/master@{#476536} [modify] https://crrev.com/b71f6a8eed67fb326ac00d673c810d0a053ad048/third_party/WebKit/LayoutTests/FlagExpectations/enable-slimming-paint-v2 [add] https://crrev.com/b71f6a8eed67fb326ac00d673c810d0a053ad048/third_party/WebKit/LayoutTests/compositing/overflow/overflow-scroll-background-fractional-offset-expected.html [add] https://crrev.com/b71f6a8eed67fb326ac00d673c810d0a053ad048/third_party/WebKit/LayoutTests/compositing/overflow/overflow-scroll-background-fractional-offset.html [add] https://crrev.com/b71f6a8eed67fb326ac00d673c810d0a053ad048/third_party/WebKit/LayoutTests/compositing/overflow/overflow-scroll-content-fractional-offset-expected.html [add] https://crrev.com/b71f6a8eed67fb326ac00d673c810d0a053ad048/third_party/WebKit/LayoutTests/compositing/overflow/overflow-scroll-content-fractional-offset.html [modify] https://crrev.com/b71f6a8eed67fb326ac00d673c810d0a053ad048/third_party/WebKit/Source/core/layout/LayoutBox.cpp [modify] https://crrev.com/b71f6a8eed67fb326ac00d673c810d0a053ad048/third_party/WebKit/Source/core/layout/LayoutBox.h [modify] https://crrev.com/b71f6a8eed67fb326ac00d673c810d0a053ad048/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp [modify] https://crrev.com/b71f6a8eed67fb326ac00d673c810d0a053ad048/third_party/WebKit/Source/core/paint/PaintLayer.cpp [modify] https://crrev.com/b71f6a8eed67fb326ac00d673c810d0a053ad048/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp [modify] https://crrev.com/b71f6a8eed67fb326ac00d673c810d0a053ad048/third_party/WebKit/Source/core/paint/ScrollableAreaPainter.cpp
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Jun 2 2017
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Comment 1 by msrchandra@chromium.org
, Feb 15 2017Status: Untriaged (was: Unconfirmed)