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A fey days ago the Wingpanel icon showed up in my dock, and it have been there ever since. It does not go away with reboots or anything.
Does someone have a way to hide i from the dock again?
Open terminal and type:
pkill wingpanel (it will kill wingpanel process, but the process should restart itself without the dock icon)
Right-click and uncheck the 'Keep in Dock'-option.
Required, but never shown