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Issue 595684 link

Starred by 1 user
Status: Duplicate
Merged: issue 584598
Owner: ----
Closed: Jul 2016
Cc:
█ vollick@chromium.org
█ aelias@chromium.org
nyerramilli@chromium.org
skobes@chromium.org
bokan@chromium.org
█ ranjitkan@chromium.org
majidvp@chromium.org
Components:
EstimatedDays: ----
NextAction: ----
OS: Linux , Windows , Mac
Pri: 2
Type: Bug



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Fixed-position elements jitter under devtools scale factor

Reported by lpa...@etouch.net, Mar 17 2016 
Chrome Version: 51.0.2681.0 2668bea689fd4a5ce07011903bca095aaf67bb07-refs/heads/master@{#381614} (32/64-bit)
OS: All (Win 7 Aero-Enabled).

Steps:
1. Lauch chrome and navigate to http://www.kohls.com/catalog/jewelry.jsp?CN=4294719765&N=4294719765+3000079323&icid=hpmf|mfs6
2. Click Inspect >> Dock it to right side >> Toggle to device mode and select 'Galaxy S5'
3. Scroll the web page in device mode and observe.

Actual: Menu header of the web page flickers on scrolling in device mode.

Expected: Menu header of web page should not flicker.

This is a regression issue broken in M-49.

Manual Regression Range:
Good Build: 49.0.2611.0
Bad Build: 49.0.2613.0

Narrow Bisect:
https://chromium.googlesource.com/chromium/src/+log/3e5a78e8f59af00fe356b62147a85edfa4899292..dd67bf44adf02bce242eaaf230d709a1493d5076?pretty=fuller&n=100

Suspecting: r367444
Actual_scroll.mp4
799 KB Download

Comment 1 by lpa...@etouch.net, Mar 17 2016 

Correction:
Good Build: 49.0.2611.0
Bad Build: 49.0.2612.0

Comment 2 by skobes@chromium.org, Mar 18 2016

Cc: bokan@chromium.org skobes@chromium.org aelias@chromium.org
Labels: -Pri-1 -hasbisect -Type-Bug-Regression -M-51 Pri-2 Type-Bug
Owner: ----
Status: Available (was: Assigned)
I don't think this is a (recent) regression, I can repro even at r367281 which is the branch base for 49.0.2611.0.

It seems related to the placement of position-fixed layers with fractional scroll offsets.  The "Search" text in the header alternates between a pixel-aligned rendering and something fuzzier (see screenshots).

Unfortunately I don't have time to dig into this further right now, so marking available.
frame1.png
94.0 KB View Download
frame2.png
93.0 KB View Download

Comment 3 by majidvp@chromium.org, Apr 7 2016

Cc: vollick@chromium.org majidvp@chromium.org
Labels: Hotlist-Input-Dev

Comment 4 by pfeldman@chromium.org, Jul 29 2016

Components: -Platform>DevTools

Comment 5 by aelias@chromium.org, Jul 29 2016

Summary: Fixed-position elements jitter under devtools scale factor (was: Regression: Menu header of the web page flickers on scrolling in device mode.)
I can still repro on Linux 53.0.2785.34, but only when the devtools zoom factor is greater than 100%.  It's possible this is fixed by r408699, I'm double-checking.

Comment 6 by aelias@chromium.org, Jul 29 2016

Mergedinto: 584598
Status: Duplicate (was: Available)
Confirmed duplicate (fixed on ToT, reproes if I revert r408699).
►

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