Enable support for StatusNotifierItem tray specification

Packages describing “tray” as local USE flag

Package “tray” Flag Description
gui-wm/sway Enable support for StatusNotifierItem tray specification
lxqt-base/lxqt-panel Build tray plugin
gui-apps/waybar Enable support for tray
media-sound/qmmp Build tray icon

All packages providing a “tray” USE flag (3)