Gtk+ clipboard manager.
Diodon is a lightweight clipboard manager for Linux written in Vala which "aims to be the best integrated clipboard manager for the Gnome/GTK+ desktop". Diodon features include Ubuntu indicator, clipboard sync (primary selection and Ctrl+C / Ctrl+V clipboard) and an option to set the clipboard size.
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Set to all to enable debug messages.
~/.local/share/diodon/storage.xml
Clipboard history file.