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With QML you can implement native fractional scaling but I don't know how it interacts with Windows's scaling mostly because I don't have a high DPI screen on my Windows computer.

My application has a setting where you can choose whatever arbitrary scale you want, smaller or larger than default.

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Here's a fun test when you get a High-DPI screen for testing: hook two screens to Windows, one high and one low-DPI. Then drag the Qt app from one window to the other.

Virtualbox's windows GUI is Qt and shows the problem pretty easily.

Is this your only complaint with regards to Qt being a "nightmare" to use on a high DPI display?

Not at all. That's just the one that's most obvious to users.

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