[arch-general] Alternating colors in thunar?

Hello, I was used to see every second line in Thunar having a grey background - after updating, this has gone, every line now has white background. BTW, after some searching, it seems to be a GTK problem, probably not specific to Thunar. I'd guess, I haven't found the correct config, yet. How can I get the alternating background colors back? Kind regards Peter