Problem in GUI in dark design mode

I am using WinSCP V5.15.9 in the dark design mode. Doing this, it is nearly impossible to identify a selected node in the explorer tree view at the left side of a session as shown in the screenshot in the attachment. This happens only if the tree view has lost the focus by clicking outside of it, for example clicking a file in the folder content at the right side. The text colour is black on a nearly black background.

Thanks for your report.
This is fixed in 5.16.3:
https://winscp.net/tracker/1810