Qt DPI scaling issue under Windows 10

Several Qt widgets fail to respect DPI scale changes until the user logs out or reboots the system.

This issue appears to manifest in all Qt based applications, including Qt Creator itself.

"Fusion" styled apps appear to be equally effected.

To duplicate the issue:

1) Ensure Qt Creator is not running.

2) Change desktop DPI scale (e.g. from 125% to 175%).

3) Start Qt Creator (see attached "image1.png" for affected widgets).

4) Close Qt Creator.

5) Logout or reboot system.

6) Restart Qt Creator again.

7) Widgets now appear to scale correctly (see "image2.png").