Highlighted button background color barely visible on white theme

[vadcx]

I'm on Manjaro KDE (Manjaro's KDE dark theme too), ZeroBrane installed via Flathub. The system theme is supposed to be dark, I guess it's either not supported or not applied through the Flathub layer. So Zerobrane is white for me.

The Search UI heavily relies on the highlight color to indicate whether a search mode is enabled. However it's basically white on white and I can't make out the difference unless I kiss the monitor. The buttons at the top toolbar are themed in the same way.

In this screenshot "W" (Match whole word) is enabled, "Re" is hovered (both have white selection backgrounds) and "Aa" (case-sensitivity) is disabled/unhovered. While you can see the difference in color, it's definitely not the contrast it's supposed to be.

Expected: toggled buttons have a high contrast color like green or blue.

ZeroBrane Studio 1.90
wxWidgets 3.14, wxLua 3.0.0.8