Please describe the problem:
When using black/white as bg/fg and white/black as base/text colors, the combobox is the only widget that uses the text color (black) to display the text on the button and the menu entries. A screenshot is attached.

Steps to reproduce:
1. Go to Setting->Appearance->Customize Theme->Colors
2. Set a dark window background and white foreground
3. Leave white background and black text for input lines 
4. Look and click on a combobox of your choice


Actual results:
dark text on dark background

Expected results:
bright text on dark background

Does this happen every time?
yep

Other information:
I would be thankful for any pointers how the colors in the combobox are determined so I could prepare a patch. I'm a bit hesitant to change anything in a 170k gtkcombobox.c without knowing much about the inner workings.