Compiler selection combo box may have the wrong size

1. Have a UHD screen scaled to 200% and a FullHD screen scaled to 100% connected to your machine.
2. Have one C-compiler configured in Creator.
3. Show Creator's Options dialog, Build & Run, Kits on the FullHD screen.
4. Select a kit.
5. Drop down the combo box for selecting a C-compiler.
   It has the right size.
6. Configure another C-compiler. Don't close the Options dialog, just click "Apply".
7. Repeat steps 3-5:
   The combo box is too small:
   

The combo box should be big enough to show all items, or at least a reasonable amount of items.