
BUG:  Fix location for mouse events.
      Fixes #8261 and some problems I was having.

msmolens/VTK,daviddoria/PointGraphsPhase1,keithroe/vtkoptix,daviddoria/PointGraphsPhase1,sumedhasingla/VTK,cjh1/VTK,spthaolt/VTK,jmerkow/VTK,jmerkow/VTK,johnkit/vtk-dev,arnaudgelas/VTK,demarle/VTK,spthaolt/VTK,demarle/VTK,biddisco/VTK,gram526/VTK,aashish24/VTK-old,johnkit/vtk-dev,sumedhasingla/VTK,keithroe/vtkoptix,demarle/VTK,mspark93/VTK,cjh1/VTK,ashray/VTK-EVM,Wuteyan/VTK,ashray/VTK-EVM,candy7393/VTK,msmolens/VTK,johnkit/vtk-dev,collects/VTK,naucoin/VTKSlicerWidgets,berendkleinhaneveld/VTK,msmolens/VTK,sankhesh/VTK,berendkleinhaneveld/VTK,gram526/VTK,msmolens/VTK,biddisco/VTK,mspark93/VTK,naucoin/VTKSlicerWidgets,ashray/VTK-EVM,keithroe/vtkoptix,spthaolt/VTK,Wuteyan/VTK,sankhesh/VTK,sumedhasingla/VTK,daviddoria/PointGraphsPhase1,hendradarwin/VTK,gram526/VTK,SimVascular/VTK,SimVascular/VTK,demarle/VTK,candy7393/VTK,cjh1/VTK,candy7393/VTK,jmerkow/VTK,daviddoria/PointGraphsPhase1,Wuteyan/VTK,sankhesh/VTK,sankhesh/VTK,keithroe/vtkoptix,spthaolt/VTK,keithroe/vtkoptix,hendradarwin/VTK,aashish24/VTK-old,mspark93/VTK,jmerkow/VTK,demarle/VTK,aashish24/VTK-old,sumedhasingla/VTK,jmerkow/VTK,biddisco/VTK,ashray/VTK-EVM,biddisco/VTK,keithroe/vtkoptix,collects/VTK,jmerkow/VTK,msmolens/VTK,sumedhasingla/VTK,collects/VTK,arnaudgelas/VTK,jeffbaumes/jeffbaumes-vtk,collects/VTK,berendkleinhaneveld/VTK,candy7393/VTK,spthaolt/VTK,johnkit/vtk-dev,johnkit/vtk-dev,cjh1/VTK,arnaudgelas/VTK,gram526/VTK,daviddoria/PointGraphsPhase1,jmerkow/VTK,demarle/VTK,arnaudgelas/VTK,spthaolt/VTK,sankhesh/VTK,sankhesh/VTK,biddisco/VTK,collects/VTK,demarle/VTK,gram526/VTK,candy7393/VTK,candy7393/VTK,naucoin/VTKSlicerWidgets,arnaudgelas/VTK,gram526/VTK,spthaolt/VTK,jmerkow/VTK,mspark93/VTK,sumedhasingla/VTK,arnaudgelas/VTK,sankhesh/VTK,berendkleinhaneveld/VTK,SimVascular/VTK,jeffbaumes/jeffbaumes-vtk,candy7393/VTK,gram526/VTK,aashish24/VTK-old,cjh1/VTK,berendkleinhaneveld/VTK,keithroe/vtkoptix,daviddoria/PointGraphsPhase1,collects/VTK,keithroe/vtkoptix,cjh1/VTK,ashray/VTK-EVM,mspark93/VTK,johnkit/vtk-dev,sumedhasingla/VTK,berendkleinhaneveld/VTK,Wuteyan/VTK,ashray/VTK-EVM,naucoin/VTKSlicerWidgets,naucoin/VTKSlicerWidgets,SimVascular/VTK,naucoin/VTKSlicerWidgets,SimVascular/VTK,jeffbaumes/jeffbaumes-vtk,mspark93/VTK,hendradarwin/VTK,mspark93/VTK,msmolens/VTK,hendradarwin/VTK,SimVascular/VTK,SimVascular/VTK,ashray/VTK-EVM,gram526/VTK,jeffbaumes/jeffbaumes-vtk,hendradarwin/VTK,biddisco/VTK,jeffbaumes/jeffbaumes-vtk,biddisco/VTK,Wuteyan/VTK,hendradarwin/VTK,berendkleinhaneveld/VTK,sumedhasingla/VTK,aashish24/VTK-old,mspark93/VTK,aashish24/VTK-old,sankhesh/VTK,candy7393/VTK,SimVascular/VTK,ashray/VTK-EVM,demarle/VTK,msmolens/VTK,Wuteyan/VTK,hendradarwin/VTK,Wuteyan/VTK,jeffbaumes/jeffbaumes-vtk,johnkit/vtk-dev,msmolens/VTK