JComboBox with custom renderer will not render correctly the selected value (arrow to big)

[sbodmer]

When I define a custom renderer on a JComboBox, the selected value is displayed (I think) with the custom renderer, but the arrow button takes all the space.

Using a common Laf (ex: Nimbus), the arrow is small and the image is displayed in full.

[DevCharly]

Thx. Fixed in main branch.

The width of the arrow button is now limited the height of a raw combobox/spinner,
which keeps it square in normal cases, but avoids that it becomes too wide.

(this image shows comboboxes and spinners that are taller than normal)