Hopefully fix thread safety issue
Hopefully fix thread safety issue

Operator = is not thread-safe, but copy constructor looks to be. This
is causing an intermittent crash.

mihadyuk/qgroundcontrol,LIKAIMO/qgroundcontrol,fizzaly/qgroundcontrol,jy723/qgroundcontrol,CornerOfSkyline/qgroundcontrol,jy723/qgroundcontrol,UAVenture/qgroundcontrol,dagoodma/qgroundcontrol,remspoor/qgroundcontrol,scott-eddy/qgroundcontrol,iidioter/qgroundcontrol,Hunter522/qgroundcontrol,Hunter522/qgroundcontrol,remspoor/qgroundcontrol,lis-epfl/qgroundcontrol,caoxiongkun/qgroundcontrol,hejunbok/qgroundcontrol,LIKAIMO/qgroundcontrol,greenoaktree/qgroundcontrol,Hunter522/qgroundcontrol,ethz-asl/qgc_asl,ethz-asl/qgc_asl,cfelipesouza/qgroundcontrol,devbharat/qgroundcontrol,TheIronBorn/qgroundcontrol,lis-epfl/qgroundcontrol,BMP-TECH/qgroundcontrol,hejunbok/qgroundcontrol,ethz-asl/qgc_asl,iidioter/qgroundcontrol,dagoodma/qgroundcontrol,greenoaktree/qgroundcontrol,scott-eddy/qgroundcontrol,nado1688/qgroundcontrol,dagoodma/qgroundcontrol,kd0aij/qgroundcontrol,LIKAIMO/qgroundcontrol,mihadyuk/qgroundcontrol,nado1688/qgroundcontrol,Hunter522/qgroundcontrol,RedoXyde/PX4_qGCS,TheIronBorn/qgroundcontrol,mihadyuk/qgroundcontrol,cfelipesouza/qgroundcontrol,RedoXyde/PX4_qGCS,UAVenture/qgroundcontrol,hejunbok/qgroundcontrol,ethz-asl/qgc_asl,CornerOfSkyline/qgroundcontrol,UAVenture/qgroundcontrol,kd0aij/qgroundcontrol,fizzaly/qgroundcontrol,dagoodma/qgroundcontrol,catch-twenty-two/qgroundcontrol,caoxiongkun/qgroundcontrol,catch-twenty-two/qgroundcontrol,remspoor/qgroundcontrol,scott-eddy/qgroundcontrol,TheIronBorn/qgroundcontrol,BMP-TECH/qgroundcontrol,CornerOfSkyline/qgroundcontrol,LIKAIMO/qgroundcontrol,TheIronBorn/qgroundcontrol,jy723/qgroundcontrol,BMP-TECH/qgroundcontrol,catch-twenty-two/qgroundcontrol,devbharat/qgroundcontrol,Hunter522/qgroundcontrol,UAVenture/qgroundcontrol,kd0aij/qgroundcontrol,jy723/qgroundcontrol,hejunbok/qgroundcontrol,greenoaktree/qgroundcontrol,nado1688/qgroundcontrol,scott-eddy/qgroundcontrol,BMP-TECH/qgroundcontrol,remspoor/qgroundcontrol,devbharat/qgroundcontrol,cfelipesouza/qgroundcontrol,catch-twenty-two/qgroundcontrol,mihadyuk/qgroundcontrol,CornerOfSkyline/qgroundcontrol,scott-eddy/qgroundcontrol,lis-epfl/qgroundcontrol,LIKAIMO/qgroundcontrol,mihadyuk/qgroundcontrol,catch-twenty-two/qgroundcontrol,cfelipesouza/qgroundcontrol,jy723/qgroundcontrol,fizzaly/qgroundcontrol,greenoaktree/qgroundcontrol,remspoor/qgroundcontrol,iidioter/qgroundcontrol,greenoaktree/qgroundcontrol,devbharat/qgroundcontrol,BMP-TECH/qgroundcontrol,fizzaly/qgroundcontrol,fizzaly/qgroundcontrol,CornerOfSkyline/qgroundcontrol,caoxiongkun/qgroundcontrol,UAVenture/qgroundcontrol,hejunbok/qgroundcontrol,devbharat/qgroundcontrol,iidioter/qgroundcontrol,kd0aij/qgroundcontrol,greenoaktree/qgroundcontrol,dagoodma/qgroundcontrol,TheIronBorn/qgroundcontrol,LIKAIMO/qgroundcontrol,kd0aij/qgroundcontrol,mihadyuk/qgroundcontrol,TheIronBorn/qgroundcontrol,catch-twenty-two/qgroundcontrol,caoxiongkun/qgroundcontrol,iidioter/qgroundcontrol,devbharat/qgroundcontrol,RedoXyde/PX4_qGCS,cfelipesouza/qgroundcontrol,cfelipesouza/qgroundcontrol,scott-eddy/qgroundcontrol,nado1688/qgroundcontrol,RedoXyde/PX4_qGCS,iidioter/qgroundcontrol,lis-epfl/qgroundcontrol,nado1688/qgroundcontrol,RedoXyde/PX4_qGCS,jy723/qgroundcontrol,hejunbok/qgroundcontrol,CornerOfSkyline/qgroundcontrol,ethz-asl/qgc_asl,UAVenture/qgroundcontrol,dagoodma/qgroundcontrol,fizzaly/qgroundcontrol,lis-epfl/qgroundcontrol,RedoXyde/PX4_qGCS,caoxiongkun/qgroundcontrol,caoxiongkun/qgroundcontrol,BMP-TECH/qgroundcontrol,nado1688/qgroundcontrol,remspoor/qgroundcontrol,kd0aij/qgroundcontrol,Hunter522/qgroundcontrol