Currently, all KDE apps built for Windows ignore the high-contrast mode/color schemes, i.e. they keep using Breeze light or Breeze dark (depending on the system-wide color preference for apps). In Kleopatra we simply didn't instantiate KColorSchemeManager if high-contrast was active to avoid this problem. And this work around doesn't address the problem that the colors should be changed if high-contrast is activated while Kleopatra is running. Time to fix this properly and for all KDE apps. Changes in kguiaddons and this project are needed. I'll submit MRs.