Default font engine: same font and text rendered very differently on secondary display

On Windows text seem quite different on different displays if the displays have different scale factors. For example if main display has the scale factor 150% and secondary display has the scale factor 100%, font will look off on the secondary display.

The problem seems to be solved by:

• Using the same scale factor for both displays
• Using freetype font engine

The difference is clearer with some fonts than others. For example with https://fonts.google.com/specimen/M+PLUS+Rounded+1c the difference is very easy to spot. Especially the upper part of some letters stand out a lot when compared to the same text on the main display and even more so with freetype font engine.

Steps to reproduce the problem:

• Ensure the displays have different scale factors
• open designer
• load the attached .ui in the designer
• move designer window (or preview window) from one screen to another while comparing the text