HIDPI background size bug

Hey everyone, I’ve got a Razer Blade Stealth running Ubuntu Mate 18.04 Daily and I’ve noticed if i disable desktop icons in mate tweak, the background image resizes to the top left quadrant.

I’ve test with different background and getting the same problem. I’ve also tried logging in and out as well as restarting.
I’ve also noticed that other backgrounds will appear and my windows will get mirrored vertically intermittently when I select different backgrounds.

@zenzou - thanks for this report. I have it on my list of issues to address this week. I’ll try to post an update as soon as I manage to fix it