on KDE5-6, ironically, to have high-contrast windows and square borders, one must use something written because the author wanted round corners on older versions of kde :)
https://github.com/matinlotfali/KDE-Rounded-Corners
Given the complexities which anything but square corners adds to screen grabs, I've never understood why anyone would want to use such.
Given the complexities which anything but square corners adds to screen grabs, I've never understood why anyone would want to use such.