Strange! I can't reproduce that on 66.0.3341.0 (canary), nor can I reproduce it on 65.0.3322.3 (dev), both on 10.13.4 beta.

TE, do you have a 10.13.3 machine handy?

Unable to reproduce this issue on reported version 64.0.3282.119 , on latest stable 64.0.3282.140 using Mac 10.13.3. Issue is also not seen in latest beta 65.0.3325.51 or 66.0.3342.0 with below steps.

1. Added 2 extensions and opened 2 chrome windows.
2. Used 4 finger swipe up and added these 2 windows and dragged one on another.
3. Now opened those windows in split screen -- didn't observe any break of omnibox and no overlapping of extensions on omnibox is seen.

@Reporter: Could you please check the steps and let us know if we miss anything. Could you also check the issue by creating fresh profile, add extensions and then check the steps? If possible please guide us with video to reproduce this issue from TE end.

Removing Needs-TesConfirmation as issue is not reproducible from TE end on Mac 10.13.3. 

++Correction 66.0.3341.0 canary.

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	809416.png 288 KB View Download

lukas.kollmer@ Seeing many extensions installed, could you please try with all of them disabled.

Here are some screen recordings:
- https://s3.amazonaws.com/files.lukaskollmer.me/embed/chrome_omnibox_extensions_enabled.mov
- https://s3.amazonaws.com/files.lukaskollmer.me/embed/chrome_omnibox_extensions_disabled.mov

Thank you for providing more feedback. Adding requester "sc00335628@techmahindra.com" to the cc list and removing "Needs-Feedback" label.

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

Able to reproduce this issue on reported version 64.0.3282.119, on latest stable 64.0.3282.140 and on latest canary 66.0.3342.0 using Mac 10.13.3. Issue is not applicable to Linux and Windows

Good Build: 63.0.3221.0
Bad Build: 63.0.3222.0

You are probably looking for a change made after 503523 (known good), but no later than 503524 (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/e4fd3cb6f5a3998fef542abb432dc39352708a3c..12255d72df0ce59a0a17c218abacd9a99c98340f

Reviewed-on: https://chromium-review.googlesource.com/677228

Suspecting same from changelog.

@lgrey: Please confirm the bug and help in re-assigning if it is not related to your change.

Thanks!

I can't repro this.

sc00335628@techmahindra.com what repro steps did you use?

Below are the steps used to reproduce. Attaching screencast for reference.

1. Opened Chrome window in maximized mode. Now from wrench menu opened New window of same profile.
2. Used 4 finger swipe and dragged Newly created window to right of previous window and opened it
3. Drag window to right/left and observe overlapping of omnibox.
4. Also restore window and observe -- still overlapping of window is seen.

Thanks!

Attaching screencast for reference.

Deleted: 809416.mp4 4.3 MB

	809416.mp4 4.3 MB View Download

Got it, thanks! Looks like the part I (and comments 3/4) missed is that both windows need to be fullscreen before they're combined on one screen.