TEs: Could you try to repro and grab a bisect?

Tested the issue on Mac OS 10.12.6 using chrome M62 #62.0.3187.0 and observed that tab title text blur while dragging the tab . 

Attached screencast for reference.

@tapted-- Could you please check attached screencast and confirm us if this is the issue which you are talking about in screencast from 0.35 secs to 0.45 secs. And also please help us with more steps to repro the issue.

Note : Unable to find the blur after dragging a tab.

Thanks!

Deleted: 756262.mp4 2.1 MB

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Blur while dragging a tab is expected. The problem is when the blurriness sticks around after releasing the tab and having it animate to its final position.

That still happens for me about 1-in-5 times on 62.0.3188.0 but not on 62.0.3178.0 dev.

Maybe this is related to 

format:commit ec48b797b4081fac96bc33a4f0bfd281bfb3c682
Author:     Sidney San Martín <sdy@chromium.org>
CommitDate: Tue Aug 15 10:57:05 2017

    Insert the content view above other views when tearing down an overlay window.

    This fixes an issue where the content ended up under the tab strip
    background view after dragging a tab out into a new window.

    Bug:  755188 
    Change-Id: I24f0da5a10b558ce426e1e080722887c44a37632
    Reviewed-on: https://chromium-review.googlesource.com/614087
    Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
    Commit-Queue: Sidney San Martín <sdy@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#494277}


I'll run a bisect if I get a chance today.

Thank you for providing more feedback. Adding requester "hdodda@chromium.org" to the cc list and removing "Needs-Feedback" label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Tested the issue on Mac os 10.12.6 using chrome M62 #62.0.3188.0 and unable to see the blur after dragging a tab.

Thanks!

Could this be related/dupe of  issue 754140 ?

Yeah - might be related. I'd seen that in dev channel (62.0.3178.0). But couldn't repro in canary. I can also see this on retina screens (tested: Version 62.0.3187.0), but the pixels are tiny so it's hard to notice.

In the photos below, you can see the stem of the blurry T spans (retina) 5 pixels, but the crisp T only spans 4.

(haven't tried a bisect yet).

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Hi, I see a difference of the tab title font between Chrome 60 Stable and latest Chrome 62 Canary when I drag and move the tab. In Canary the tab title font is blurry during the dragging and in Stable it is crisp.

Please find attached two screencast comparing the two builds.

I am using a MacBook Air 11" Non-Retina.

Deleted: Canary_62.mov 4.3 MB

Canary_62.mov 4.3 MB Download

Deleted: Chrome_60.mov 2.0 MB

Chrome_60.mov 2.0 MB Download

I bisected to 

You are probably looking for a change made after 492971 (known good), but no later than 492972 (first known bad).
CHANGELOG URL:
The script might not always return single CL as suspect as some perf builds might get missing due to failure.
  https://chromium.googlesource.com/chromium/src/+log/d5ea6ad9b7b5af521c634c6461227c619b6728a1..1f71c6ec3d33ac53f8e2474fbfd9e6396f731008

1f71c6e Use a custom frame view class for browser windows. by Sidney San Martín · 11 days ago

r492972 -> https://chromium-review.googlesource.com/562603


Although I noticed on the "good" revisions tabs sometimes got stuck in other ways (see attached). They just didn't go blurry :/

Deleted: bisect.log 5.5 KB

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Deleted: Screen Shot 2017-08-21 at 9.58.38 am.png 87.2 KB

	Screen Shot 2017-08-21 at 9.58.38 am.png 87.2 KB View Download

> Although I noticed on the "good" revisions tabs sometimes got stuck in other ways.

This has been already reported in  issue 754140 . But it is not easy to reproduce.

I've found a consistent repro case in  issue 764923  - 
The key is that you have to mouse-up on the tab to drop it while it's moving quickly. A video is attached in that bug

 Issue 764923  has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/fe9306b1223c8a20bf83096aa940e02678109c08

commit fe9306b1223c8a20bf83096aa940e02678109c08
Author: Sidney San Martín <sdy@chromium.org>
Date: Mon Dec 18 17:53:31 2017

Fix tabs getting stuck between pixels after a drag.

The placeholder frame is based on `-[NSEvent mouseLocation]`, which isn't
aligned to device pixels. Use `-centerScanRect:` to align it before storing it.

Bug:  756262 
Change-Id: I54dd54866a3fe0433c986b368d563d51d4f2256f
Reviewed-on: https://chromium-review.googlesource.com/832826
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Sidney San Martín <sdy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524739}
[modify] https://crrev.com/fe9306b1223c8a20bf83096aa940e02678109c08/chrome/browser/ui/cocoa/tabs/tab_strip_drag_controller.mm

This should be fixed in tomorrow's canary.

(FWIW, I believe that the bisect pointed to my frame CL because it made the tab strip layer backed.)

Tested this issue on Mac 10.12.6 (non retina) as per the C#0 & C#3 using latest canary-	65.0.3299.0.Observed no blurry text while dragging tabs & also once dragging is done.As per C#9, tabs are not getting stuck. 

tapted@
Please find the attached screencast for reference & confirm the fix and the expected behavior are same?

Thanks in advance..!

Deleted: 756262-Mac.mp4 3.6 MB

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looks good - thanks for the fix Sidney!

🙌

As it is working as intended on mac using chrome#65.0.3299.0.Hence adding TE Verified labels.

Thanks.!