- Update to version 1.6.6
* Dismiss critical notification when connecting to AC
* Fix inhibiting xfce4-screensaver (bxo#16364)
* settings: Move % sign out of spinbutton (bxo#15994)
* panel-plugin: Toggle presentation mode on middle click
* panel-plugin: Properly show 'About' menu item
* panel-plugin: Add missing about callback
* panel-plugin: Properly hook up about signal
* panel-plugin: Replace deprecated call
* Switch to symbolic window-close icons