Don't have set up with KDE Neon (Plasma 5.8.4) to test and confirm this as of now. However based on the timeline of the issue and above updates from the reporter.

thomasanderson@: Could this be related to https://codereview.chromium.org/2575563002 from https://chromium.googlesource.com/chromium/src/+log/56.0.2924.21..56.0.2924.51?pretty=fuller&n=10000

ajha@ It's unlikely.  Is it possible to get a more narrow bisect?

Don't spend any time tracking this down just yet.  I installed KDE Neon in virtual box and do NOT have the issue I reported on the default desktop.

I'm going to try to replicate my system settings and see if I can produce the problem again.  Will update later

Thank you for providing more feedback. Adding requester "ajha@chromium.org" for another review and adding "Needs-Review" label for tracking.

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

C#3> Don't have set up with KDE Neon (Plasma 5.8.4) to bisect this.

Will wait for update as per C#4 to see if the issue is still reproducible? 

Sorry guys, this has been really frustrating.  I've spent at least 3 hours on three separate occasions trying but I can't reproduce my own problem in a VM.  On one hand, I want to say don't worry about it.. but on the other hand this issue is wearing on my nerves.  I don't want to waste anyone's time.

I know the KDE folks are working on adding a global menu back into KDE as an optional alternative... so there is perhaps a possibility that some background update to Plasma slipped in that is tricking chrome into thinking I have a global menu like Unity has.

http://blog.broulik.de/2016/10/global-menus-returning/

That's all I can think of.  Otherwise, is there any way to get chrome to spit out some super verbose debug info to maybe hint at a cause?

OP when you first saw the issue, did you just switch from Unity to KDE?  Or perhaps have Unity running on a separate X display like :1?

No, I've never used Unity.  Just a basic KDE Neon install

I hadn't been making any system changes either.. it just started happening out of nowhere so I suspected an update broke it.

The problem is the following:
Since KDE Plasma 5.6 it supports the Unity launcher API (it creates a com.canonical.Unity DBus service), so once you have libunity installed(!), Chrome will start exporting e.g. download progress to it.

Unfortunately, it now thinks it's running on Unity which has window buttons in its top panel and hides them from its own window decoration.

Adding  TE-NeedsTriageFromMTV as we don't have set up with KDE Neon (Plasma 5.8.4).

MTV@ Could any one from MTV please look into this issue if you have a setup there.

Thanks,