Xiyuan, could you triage, since you looks to be an owner of related code in ash/?

Let me attach a screen shot of the issue.

Deleted: Screenshot 2017-10-19 at 15.18.51.png 88.6 KB

	Screenshot 2017-10-19 at 15.18.51.png 88.6 KB View Download

+mustash folks in case they have an idea.

I couldn't repro on yesterday's ToT though (#508579)

James recently changed c/b/ui/ash/multi_user/, but I can't repro on ToT (#509843) either.
yoshiki@, does this repro reliably for you? Any advice for us unable to repro?

Hrm, I seem to remember testing this behavior when I landed my multi_user change https://chromium-review.googlesource.com/c/chromium/src/+/687986 and it worked then. (This was on linux desktop, I don't recall if I manually tested on device.)

+estade

I saw this issue on caroline and eve. And today's canary (64.0.3243.0, 10049.0.0, caroline) still has the issue.

I see this issue frequently but don't find the exact trigger of this issue. 

I recorded a video to repro this issue. At the first I didn't see the issue (-0:15 on the video). I just randomly activated, minimized and maximized a window (0:15-0:45 on the video) and I can get a repro (0:45-0:52).
https://drive.google.com/a/google.com/file/d/1PE6RJpVZkK75k9w2JF5mtEp3i3l-Q6gg/view?usp=sharing 

I believe the code that's supposed to accomplish this is here[1] but I don't know why it would have broken because it hasn't been touched recently.

[1] https://cs.chromium.org/chromium/src/chrome/browser/ui/ash/multi_user/user_switch_animator_chromeos.cc?rcl=e9855f7a88df8eca0976faa6b37c59a0a229e10d&l=224

Had this machine been in tablet mode? erg and I both made some changes to tablet mode recently.

I think there's special code in the multi user window manager for maximized windows, so maybe being maximized is important.

I can't repro on device on link with chrome ToT from yesterday, even with going in/out tablet mode. :-(  Do you have any idea when it was working OK?