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4. Upstream Issue
Panel Plugins
Issue caused by an upstream library (Gtk / GLib / Gio / Gvfs /...) A link to the upstream issue should be added to the issue. It might make sense to keep the Xfce issue open in order to implement a workaround.
5. Panel Menu / Widget
Panel Plugins
The menu / widget that opens up when you left click a panel plugin
5. Window Decorations
Panel Plugins
WM title bar and window borders or Client Side Decorations (CSD)
Prioritized