Fix for ScrollZoomer being updated for Qwt6.x.
Fix for ScrollZoomer being updated for Qwt6.x.

jy723/qgroundcontrol,nado1688/qgroundcontrol,scott-eddy/qgroundcontrol,Hunter522/qgroundcontrol,scott-eddy/qgroundcontrol,scott-eddy/qgroundcontrol,caoxiongkun/qgroundcontrol,BMP-TECH/qgroundcontrol,LIKAIMO/qgroundcontrol,BMP-TECH/qgroundcontrol,mihadyuk/qgroundcontrol,hejunbok/qgroundcontrol,cfelipesouza/qgroundcontrol,BMP-TECH/qgroundcontrol,RedoXyde/PX4_qGCS,fizzaly/qgroundcontrol,kd0aij/qgroundcontrol,nado1688/qgroundcontrol,TheIronBorn/qgroundcontrol,Hunter522/qgroundcontrol,josephlewis42/UDenverQGC2,ethz-asl/qgc_asl,mihadyuk/qgroundcontrol,cfelipesouza/qgroundcontrol,lis-epfl/qgroundcontrol,mihadyuk/qgroundcontrol,scott-eddy/qgroundcontrol,hejunbok/qgroundcontrol,hejunbok/qgroundcontrol,greenoaktree/qgroundcontrol,LIKAIMO/qgroundcontrol,kd0aij/qgroundcontrol,nado1688/qgroundcontrol,LIKAIMO/qgroundcontrol,cfelipesouza/qgroundcontrol,lis-epfl/qgroundcontrol,remspoor/qgroundcontrol,iidioter/qgroundcontrol,UAVenture/qgroundcontrol,RedoXyde/PX4_qGCS,dagoodma/qgroundcontrol,iidioter/qgroundcontrol,devbharat/qgroundcontrol,greenoaktree/qgroundcontrol,remspoor/qgroundcontrol,jy723/qgroundcontrol,nado1688/qgroundcontrol,RedoXyde/PX4_qGCS,remspoor/qgroundcontrol,greenoaktree/qgroundcontrol,greenoaktree/qgroundcontrol,devbharat/qgroundcontrol,remspoor/qgroundcontrol,devbharat/qgroundcontrol,scott-eddy/qgroundcontrol,CornerOfSkyline/qgroundcontrol,josephlewis42/UDenverQGC2,caoxiongkun/qgroundcontrol,UAVenture/qgroundcontrol,LIKAIMO/qgroundcontrol,TheIronBorn/qgroundcontrol,remspoor/qgroundcontrol,lis-epfl/qgroundcontrol,TheIronBorn/qgroundcontrol,TheIronBorn/qgroundcontrol,UAVenture/qgroundcontrol,dagoodma/qgroundcontrol,jy723/qgroundcontrol,UAVenture/qgroundcontrol,BMP-TECH/qgroundcontrol,kd0aij/qgroundcontrol,CornerOfSkyline/qgroundcontrol,cfelipesouza/qgroundcontrol,Hunter522/qgroundcontrol,josephlewis42/UDenverQGC2,dagoodma/qgroundcontrol,catch-twenty-two/qgroundcontrol,josephlewis42/UDenverQGC2,catch-twenty-two/qgroundcontrol,CornerOfSkyline/qgroundcontrol,CornerOfSkyline/qgroundcontrol,cfelipesouza/qgroundcontrol,ethz-asl/qgc_asl,lis-epfl/qgroundcontrol,fizzaly/qgroundcontrol,TheIronBorn/qgroundcontrol,remspoor/qgroundcontrol,RedoXyde/PX4_qGCS,dagoodma/qgroundcontrol,ethz-asl/qgc_asl,UAVenture/qgroundcontrol,fizzaly/qgroundcontrol,kd0aij/qgroundcontrol,hejunbok/qgroundcontrol,dagoodma/qgroundcontrol,TheIronBorn/qgroundcontrol,fizzaly/qgroundcontrol,dagoodma/qgroundcontrol,greenoaktree/qgroundcontrol,CornerOfSkyline/qgroundcontrol,kd0aij/qgroundcontrol,catch-twenty-two/qgroundcontrol,UAVenture/qgroundcontrol,iidioter/qgroundcontrol,iidioter/qgroundcontrol,catch-twenty-two/qgroundcontrol,scott-eddy/qgroundcontrol,Hunter522/qgroundcontrol,jy723/qgroundcontrol,Hunter522/qgroundcontrol,fizzaly/qgroundcontrol,caoxiongkun/qgroundcontrol,hejunbok/qgroundcontrol,iidioter/qgroundcontrol,greenoaktree/qgroundcontrol,CornerOfSkyline/qgroundcontrol,jy723/qgroundcontrol,devbharat/qgroundcontrol,LIKAIMO/qgroundcontrol,RedoXyde/PX4_qGCS,devbharat/qgroundcontrol,caoxiongkun/qgroundcontrol,ethz-asl/qgc_asl,kd0aij/qgroundcontrol,BMP-TECH/qgroundcontrol,iidioter/qgroundcontrol,caoxiongkun/qgroundcontrol,hejunbok/qgroundcontrol,lis-epfl/qgroundcontrol,fizzaly/qgroundcontrol,catch-twenty-two/qgroundcontrol,catch-twenty-two/qgroundcontrol,nado1688/qgroundcontrol,mihadyuk/qgroundcontrol,Hunter522/qgroundcontrol,BMP-TECH/qgroundcontrol,ethz-asl/qgc_asl,caoxiongkun/qgroundcontrol,mihadyuk/qgroundcontrol,LIKAIMO/qgroundcontrol,nado1688/qgroundcontrol,devbharat/qgroundcontrol,jy723/qgroundcontrol,RedoXyde/PX4_qGCS,cfelipesouza/qgroundcontrol,mihadyuk/qgroundcontrol