Qt Creator fonts are different compared to other Qt applications

This has been the case for a while, but I've never reported it. Now, for some reason, the look changed to make them smaller instead of bigger, making Qt Creator unusable for me.

Environment:

• Qt Creator df80454d26dc91423c4bc6d76e6a94b9964e2e02 (master branch)
• Linux/X11
• QT_AUTO_SCREEN_SCALE_FACTOR is unset
• QT_SCREEN_SCALE_FACTORS is set to "2;2"
• X's font DPI set to 240

The icons are the right size, but Qt Creator's fonts are slightly too small.

With QT_SCREEN_SCALE_FACTORS unset:

In this case, the fonts have the right size and the icons in the menu and the "Welcome" one look right, but the Edit one does not.

This is additionally a change compared to Qt Creator 007fd9fa9b9588ff66f2cc5863c42069f61307cb. With QT_SCREEN_SCALE_FACTORS set:

The Qt Creator on the bottom is the new (current) and its fonts are too small. The one on top is the older one, running with the same Qt, and looks right.