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Issue 823208 link

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Issue metadata

Status: Fixed
Owner:
Closed: Mar 2018
Cc:
Components:
EstimatedDays: ----
NextAction: ----
OS: Linux , Windows
Pri: 3
Type: Bug-Regression



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Regression : [md-extensions] Down arrow of a vertical scrollbar goes missing after resizing the browser window.

Reported by avsha...@etouch.net, Mar 19 2018

Issue description

Chrome Version : 67.0.3375.0 (Official Build) 9a9b208d93102cd427f37a45e2bdc28c07f23cbc-refs/heads/master@{#543961} 32/64-bit
OS : Windows(7,8,8.1,10), Linux(14.04 LTS)

What steps will reproduce the problem?
1. Launch chrome and navigate to chrome://extensions/ page.
2. Now resize the browser window upwards till down arrow of a vertical scroll goes missing. (Kindly review an attached screencast)

Actual Result : Down arrow of a vertical scroll goes missing after resizing the browser window.

Expected Result : Both the arrow icons (Up & Down) should remain at thier positions even after resizing browser window upwards to its max limit.

This is a regression issue, broken in M-64 and providing the bisect using Per-Revision script:
Good Build : 64.0.3275.0 (Revision : 518487)
Bad Build : 64.0.3276.0 (Revision : 518818)

You are probably looking for a change made after 518799 (known good), but no later than 518815 (first known bad).

CHANGE-LOG URL:
https://chromium.googlesource.com/chromium/src/+log/509d78a660bc5fb4fb07bc76bc76aeabd59248f0..921b2848e6e7a1157e1b21b069aa9d4dd7fffad4

Suspect : https://chromium.googlesource.com/chromium/src/+/5f77a030e8487c9c5c0c2c12f3e976b125230e98

@dpapad : Could you please check whether this is caused with respect to your change, if not please help us in assigning it to the right owner.

Note : 
1. This issue is not observed on Mac(10.12.6, 10.13.1, 10.13.4) OS
2. Issue is also reproducible in Stable #65.0.3325.162, Beta #66.0.3359.33 and Dev #67.0.3371.0 builds.
 
Actual_Scrollbar.mp4
429 KB View Download
Expected_Scrollbar.mp4
520 KB View Download

Comment 1 by dpa...@chromium.org, Mar 19 2018

Labels: -Pri-1 Pri-3

Comment 2 by dpa...@chromium.org, Mar 19 2018

Status: Started (was: Assigned)
Candidate fix at https://chromium-review.googlesource.com/c/chromium/src/+/969095.
Project Member

Comment 3 by bugdroid1@chromium.org, Mar 19 2018

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5c2804038cdfad9422f3cf3c5bbb8d8450de3d1a

commit 5c2804038cdfad9422f3cf3c5bbb8d8450de3d1a
Author: dpapad <dpapad@chromium.org>
Date: Mon Mar 19 22:53:12 2018

MD Extensions: Fix corner-case where available width is less than padding.

Bug:  823208 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I93a95f26e5910fe3fa98f6ad43c0d629bbf4f587
Reviewed-on: https://chromium-review.googlesource.com/969095
Reviewed-by: Scott Chen <scottchen@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544195}
[modify] https://crrev.com/5c2804038cdfad9422f3cf3c5bbb8d8450de3d1a/chrome/browser/resources/md_extensions/item_list.html

Comment 4 by dpa...@chromium.org, Mar 19 2018

Status: Fixed (was: Started)

Comment 5 by avsha...@etouch.net, Mar 21 2018

Update : 
Retested above issue in latest Canary #67.0.3377.0 build on Windows(7,8,8.1,10) and Linux(14.04 LTS) OS and the original issue is still reproducible with slightly different behavior. Now two vertical scrollbars are being shown and the first scrollbar still does not have 'down arrow' icon when md-extensions page is resized. Kindly review an attached screen-cast.
Canary_behavior.mp4
441 KB View Download

Comment 6 by dpa...@chromium.org, Mar 21 2018

The observed behavior in #5 is the correct one. The inner scrollbar's (left) arrow will show up, when you scroll the outer (right) to the bottom.

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