This happens random and seldomly, but it does.
Sometimes when I have the keyboard open, and switch to another app, the keyboard doesn't retract.
Typing on Slide (reddit) app: http://i.imgur.com/rveNldQ.png
Hit the recent apps button: http://i.imgur.com/Vxk1wWB.png
This has happened on WhatsApp and Chrome as well.
- Nexus 5
- Android 6.0.1 stock
- Swiftkey v184.108.40.206