Steps:
1) Enable on-screen keyboard system tray
2) On a secondary touch screen monitor, press the button to invoke the floating keyboard on the secondary display.
3) Move it around
Expected: Moves!
Actual: Might move?
What's happening here is some of the math for restricting the bounds assumes there's one display and is causing incorrect semi-predictable behavior.
Comment 1 by blakeo@chromium.org
, Apr 4 2018