def move_to_workspace(target_workspace)
      if target_workspace == 'next'
        target_workspace = Wmctile.current_workspace + 1
      elsif target_workspace == 'previous'
        target_workspace = Wmctile.current_workspace - 1
      end
      system "wmctrl -ir #{@id} -t #{target_workspace}"
    end
def move_to_workspace(target_workspace)
      if target_workspace == 'next'
        target_workspace = Wmctile.current_workspace + 1
      elsif target_workspace == 'previous'
        target_workspace = Wmctile.current_workspace - 1
      end
      system "wmctrl -ir #{@id} -t #{target_workspace}"
    end
Moves the window to workspace given in @arguments.

 @param [String] target_workspace Target workspace index or "next"/"previous".

 @return [void]