LaunchPad display messed up on High-DPI devices

[tim-seoss]

Dunno how much this is a limitation of Tk (I know it's not with other Python UI libraries like Qt), but the LaunchPad app is partially unusable on high-dpi displays currently. This on Linux with a 4k 28 inch monitor (which is only a 200 quid device now, so not luxury/rare by any means).

e.g. see screenshot with tiny text and missing apply-config button (or whatever it says - I can't see it, apart from the very edge of the button at the bottom - other buttons like the 'Advanced' button is missing entirely).