Hello, Dear Santa.
I've been a real good boy and made all that clean reinstall step by step exactly. I've also imported the settings at the end, as I definetely don't want to go through all the settings again manually.
And I'm getting this window icon again.
Please, Santa, don't give them no presents - to ppl who can't even hide a window properly! Oh, for ducks sake, why did I have to go through all the reinstalls in the first place?! It's a simple and obvious issue, make a fix for that!