Here is the change log URL

 https://chromium.googlesource.com/chromium/src/+log/79fa2a1569a855e29a25178807403664a4b29fc5..58c0f982d2c8bef57b173e0f62748a9b8f722e2e

unable to find actual suspect from the log

Able to reproduce this issue on Ubuntu 14.04. This issue is not observed on Mac OS 10.12.4, clicking on manage certificate the behavior looks different in Mac.

I don't think this is a regression - the new UI is a completely new
material design settings, starting from M59.  So comparison with the old
UI or bisect data is meanless here.

Also, attached video looks lost the extension (.ogv), attaching the same file again here.

Deleted: Actual_manage.ogv 3.5 MB

	Actual_manage.ogv 3.5 MB View Download

The problem occurs at ~0:30 in the attached video.

To reproduce:

1. Set the default font size "very large"
2. Show certificate manager (chrome://settings/certificates)
3. Go to "AUTHORITIES" tab
4. pick "org-AC Camerfirma SA CIF A82743287", expand the submenu
5. Click 3-dot icon to the right of "Chambers of Commerce Root" and select "View"
6. Certificate window pops up. Click "Details" tab
7. In "Certificate Hierarchy", make sure "Builtin Object Token: Camerfirma..."
   is long enough not to fit in the area and see the scrollbar at the bottom
8. slide the scrollbar to the right. The highlight of the "Builtin Object
   Token: Camerfirma..." line is chopped at the edge of the original right
   end.

This seems to be a bug in painting - speculatively adding Blink>Paint component.

Mac version uses the OS-derived certificate manager and the material design
certificate manager is not used.

I apparently don't have any untrusted certificates to reproduce. How do I get me some?

Lowering the priority. You need to dig deep to see this and few people will.

This also happens using the old settings page (see screenshot), since both old and new share the same certificate viewer.

Deleted: focus_partial.png 111 KB

	focus_partial.png 111 KB View Download

The NextAction date has arrived: 2017-06-26

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available.

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