Looks like I have two users who are reporting this issue - “onscreen keyboard keeps popping up even when disabled”.

Here's two reports with logs:

- User on M63:  https://listnr.corp.google.com/report/85101836138
- Googler on M66: https://listnr.corp.google.com/report/85041626514

The accessibility keyboard is enabled when invoking emoji/hw/voice input, but not disabled when closing the inputs [1].
We should disable it in OnKeyboardHidden() when it was forcibly enabled only for those inputs.

[1]: https://cs.chromium.org/chromium/src/ash/system/ime_menu/ime_menu_tray.cc?sq=package:chromium&dr=CSs&l=397

Sorry, I seem to have jumped to the conclusion. DisableVirtualKeyboard() is called on the last line of OnKeyboardHidden(), so for some reason, is it not called?

It's by design.

Since user want to open some layout temporary.

The issue is that on-screen keyboard is not disabled after closing the emoji keyboard.
We should disable on-screen keyboard option after closing the temporary keyboard.

I reproduced the issue.
It's easy to reproduce if you open multiple windows and double tap the emoji mark, so that the second tap taps a window which wasn't focused.

The issue happens when the keyboard state transition is:
INITIAL -> LOADING_EXTENSION
LOADING_EXTENSION -> HIDDEN

without succeeding
HIDDEN -> SHOWN
SHOWN -> HIDDEN
where the last transition should cause OnKeyboardHidden and then DisableVirtualKeyboard.

WIP CL: https://chromium-review.googlesource.com/c/chromium/src/+/958885
This contains a bug that windows don't resize after keyboard closed.

Bulk edit: oka@ is no longer working on virtual keyboard.

We no longer force enable the accessibility keyboard for shelf. See https://chromium-review.googlesource.com/c/chromium/src/+/1186284

Verified in 70.0.3538.o 11038 canary-channel bob 
Input tools version:
71.0.20180903.211395702