Hm 1.1.6 dmg file includes a Info.plist file and in 1.2.1 it is missing. So I'm pretty sure this causes the problem. From this page: http://doc.qt.io/qt-5/highdpi.html I would guess the missing part is the NSPrincipalClass.
I'm not sure where you would need to put the Info.plist file (no Mac user), but judging from 1.1.6 its content should be something like this:
Steps to reproduce: Open the app, it's blurry.
Don't know if the dmg was built with a wrong version of QT, but it looks like a massive regression as soon as you open it on a hi-dpi machine (most of them are now).
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