The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/394208b1512d343f32bd9ddd606d9abae88be906

commit 394208b1512d343f32bd9ddd606d9abae88be906
Author: estade <estade@chromium.org>
Date: Wed Mar 16 20:48:11 2016

[MD] Fix bookmark bar button overflow during bar animation.

BUG= 595167 

Review URL: https://codereview.chromium.org/1804343002

Cr-Commit-Position: refs/heads/master@{#381528}

[modify] https://crrev.com/394208b1512d343f32bd9ddd606d9abae88be906/chrome/browser/ui/views/bookmarks/bookmark_bar_view.cc

yup, present in m50. Hard to get a screenshot of this in action but here's my best attempt (attached to justify merge request)

Deleted: boomkarkproblem.png 6.3 KB

	boomkarkproblem.png 6.3 KB View Download

Your change meets the bar and is auto-approved for M50 (branch: 2661)

Please merge your change (if it is a safe merge) to M50 branch 2661 either today or tomorrow so we can pick up for next week Beta. Thank you.

the fix caused a regression or two, so I'm going to hold off on merging.

What were the regressions?

I'm working on a similar  issue 596073  and just wanted to be aware of any potential risks.

see bugs linked in (and hopefully fixed by) https://codereview.chromium.org/1815743002/

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1d99db566e1d5b5e4807aaa991fd8d7de18ff4ac

commit 1d99db566e1d5b5e4807aaa991fd8d7de18ff4ac
Author: Evan Stade <estade@chromium.org>
Date: Mon Mar 21 20:23:46 2016

[MD] Fix bookmark bar button overflow during bar animation.

BUG= 595167 

Review URL: https://codereview.chromium.org/1804343002

Cr-Commit-Position: refs/heads/master@{#381528}
(cherry picked from commit 394208b1512d343f32bd9ddd606d9abae88be906)

Review URL: https://codereview.chromium.org/1820793003 .

Cr-Commit-Position: refs/branch-heads/2661@{#327}
Cr-Branched-From: ef6f6ae5e4c96622286b563658d5cd62a6cf1197-refs/heads/master@{#378081}

[modify] https://crrev.com/1d99db566e1d5b5e4807aaa991fd8d7de18ff4ac/chrome/browser/ui/views/bookmarks/bookmark_bar_view.cc

Tested the same on win8.1, mac 10.11 and Linux 14.04 chrome version 50.0.2661.48 by enabling top-chrome-md in chrome://flags - opening/closing the bookmark no overlapping observed on the the location bar.

Please find the screencast

Deleted: Recording #23.mp4 481 KB

Recording #23.mp4 481 KB Download