Joey

"Shotwell" and "Inkscape" have the wmclasses of the same name (and case), just my 2 cents ;) Steam (the gaming platform) might be another candidate for a whitelist entry; wmclasses...

Just to drop you an info what worked out for me (as i had the same problem): `sudo snap refresh notepadqq --edge --classic` On my Ubuntu 18.04 i had before:...