Giovanni Campagna fa44dc7d16 MessageTray: don't list the sources all the time
The point of a hash table is that you don't need to list all the
elements. To avoid that, keep a "clearableCount" in MessageTray,
which can be used by the message tray menu to show and hide the
clear item, and that is updated in constant time when sources
are added or removed.

https://bugzilla.gnome.org/show_bug.cgi?id=700194
2013-05-12 21:06:34 +02:00
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