Just use GlowEffectRad to indicate effect presense: radius of 0 means effect is disabled. Change-Id: Ic06bba34f5a851f120d3d00cb7e20c429ead9ee1 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/94732 Tested-by: Jenkins Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>