(9/19's updated version)
version 60.0.3112.10 (officail build) unknown (64 bit)
Platform 9592.9.0（official build) dev-channel link test 
Firmware Google_Link.2695.1.169


REPRO STEPS:
1. Switch to US keyboard compact layout
2. Enabled gesture feature
3. Swipe on blank area of the keyboard(e.g. Swipe up/down on the two edge, swipe left/right on the suggestion line)


ACTUAL RESULTS
Floating window of some letter(s) pops up.


Note:
1.Also repro on 61.0.3163.70
9765.48.0 beta-channel caroline.
 

Deleted: Swipe.mp4 151 KB

	Swipe.mp4 151 KB View Download

Deleted: Swipe2.mp4 210 KB

	Swipe2.mp4 210 KB View Download