Invert the selection sense for legend items as we did with Qwt5
Invert the selection sense for legend items as we did with Qwt5

wuliming/pcp,edwardt/pcp,prasincs/pcp,mbaldessari/pcp,adfernandes/pcp,andyvand/cygpcpfans,prasincs/pcp,andyvand/cygpcpfans,mbaldessari/pcp,andyvand/cygpcpfans,mbaldessari/pcp,andyvand/cygpcpfans,adfernandes/pcp,wuliming/pcp,adfernandes/pcp,aeg-aeg/pcpfans,wuliming/pcp,andyvand/cygpcpfans,andyvand/cygpcpfans,edwardt/pcp,adfernandes/pcp,wuliming/pcp,edwardt/pcp,wuliming/pcp,prasincs/pcp,mbaldessari/pcp,aeg-aeg/pcpfans,aeg-aeg/pcpfans,aeg-aeg/pcpfans,aeg-aeg/pcpfans,tjanez/pcp,edwardt/pcp,adfernandes/pcp,adfernandes/pcp,edwardt/pcp,aeg-aeg/pcpfans,prasincs/pcp,andyvand/cygpcpfans,mbaldessari/pcp,tjanez/pcp,adfernandes/pcp,edwardt/pcp,wuliming/pcp,mbaldessari/pcp,adfernandes/pcp,tjanez/pcp,tjanez/pcp,tjanez/pcp,aeg-aeg/pcpfans,prasincs/pcp,tjanez/pcp,tjanez/pcp,prasincs/pcp,tjanez/pcp,wuliming/pcp,aeg-aeg/pcpfans,prasincs/pcp,andyvand/cygpcpfans,prasincs/pcp,edwardt/pcp,wuliming/pcp,edwardt/pcp