Comment # 3 on bug 1230637 from Stefan Dirsch

Colors are correct once I uninstall Mesa-dri package (drivers including
"swrast")

$ yast2 &
QStandardPaths: runtime directory '/run/user/1000' is not owned by UID 0, but a
directory permissions 0700 owned by UID 1000 GID 1000
qt.glx: qglx_findConfig: Failed to finding matching FBConfig for
QSurfaceFormat(version 2.0, options QFlags<QSurfaceFormat::FormatOption>(),
depthBufferSize -1, redBufferSize 1, greenBufferSize 1, blueBufferSize 1,
alphaBufferSize -1, stencilBufferSize -1, samples -1, swapBehavior
QSurfaceFormat::SingleBuffer, swapInterval 1, colorSpace
QSurfaceFormat::DefaultColorSpace, profile  QSurfaceFormat::NoProfile)
$

So I'm pretty sure that the OpenGL backend of Qt is being used by default by
YaST.