You are probably looking for a change made after 504350 (known good), but no later than 504351 (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/b34fe684c6a5cd0bc0efacafadf8e934dc392a0f..41cab4fdf74e694376012b622c61a4e8e04fae89

Suspect:https://chromium.googlesource.com/chromium/src/+/41cab4fdf74e694376012b622c61a4e8e04fae89

@dullweber: Kindly help to reassign, if your changes are not related to this issue.

Thanks, this looks like my cl. I will check, why the scrollbar is shown, although there is still space left.

This is really weird. There seems to be no reason for the scrollbar. The dialog has more than enough space below the inner element.

Scrolling from 100% to 90% makes the scrollbar appear. Scrolling to 80% makes it disappear and going back to 90% doesn't make it reappear. Only changing to 100% and back to 90% shows a scrollbar.

Also changing the body-container-height from 322px to 323px makes the scrollbar disappear for 90% but then it appears at 75% without any reason. This looks more like a bug with the scrollbar system?

dschuyler@: Have you seen something like this before? I found a few older bug reports for CBD and settings but it looks like there always was too much content that caused scrollbars to appear.

#3 Yes there are three common cases for unwanted scroll bars that I'm aware of:

- due to a very large font size. This is an action taken by the user. If the content no longer fits, a scroll bar is acceptable (these are WontFix). This is not this bug, I mention it for completeness.

- due to a blink issue. This is my *guess* for this bug.

- due the WebUI programmer making a whoops. When this happens it's usually a simple fix and not a mystery.

I'd suggest doing what you already did in #3: take a look at it assuming it's your bug until to proves to be a deeper issue. The next step would be to hand it off to blink for the deeper investigation. Tip: I'm sure they'd appreciate a minimal repro case. i.e. Paste a link to a jsfiddle showing the problem.

Thanks. I will try to create a smaller reproduction case.

I managed to create a minimal example: https://jsfiddle.net/nrqhhugL/

It shows a scrollbar with 90% zoom although the div is empty. 
(In Chrome Dev 63.0.3230.0 on Linux)

Deleted: Screenshot from 2017-10-06 14:54:39.png 179 KB

	Screenshot from 2017-10-06 14:54:39.png 179 KB View Download

I filed a bug for it 

The issue has been fixed in 64.0.3267.0	( https://crbug.com/777095 )