Currently when disabling Clipman via right-click on systray icon > Disable, there is no visual indication whatsoever (unless you specifically access the c-menu) that the clipboard is disabled. It would be useful if Clipman used a dynamic iconset: the usual theme icon when Clipman is enabled, and a custom icon denoting that Clipman is disabled otherwise. For example Clipman could use the 'stop' or 'cancel' stock Gtk icon. Or it could ship a custom icon that has a stop/cancel icons superposed, or similar.
My vote for it Ref. https://bugzilla.xfce.org/show_bug.cgi?id=9896#c3 https://bugzilla.xfce.org/show_bug.cgi?id=12619#c3
Simon Steinbeiss referenced this bugreport in commit d5026a926307a9c2488f599ec21877b5dde3075d panel-plugin: Indicate if clipman is disabled (Bug #11381) https://git.xfce.org/panel-plugins/xfce4-clipman-plugin/commit?id=d5026a926307a9c2488f599ec21877b5dde3075d
This is easier/cleaner to fix in the panel plugin and as the systray has been deprecated, I don't want to hack this feature in there for now.