Added node title background highlights for selected nodes.
Added node title background highlights for selected nodes.

(transplanted from orange/572797f576ade81d53a9da0f1bf8fa2c3818ba0d)

qusp/orange3,marinkaz/orange3,kwikadi/orange3,qusp/orange3,kwikadi/orange3,qPCR4vir/orange3,cheral/orange3,marinkaz/orange3,qPCR4vir/orange3,marinkaz/orange3,qPCR4vir/orange3,cheral/orange3,cheral/orange3,kwikadi/orange3,marinkaz/orange3,qPCR4vir/orange3,marinkaz/orange3,qPCR4vir/orange3,marinkaz/orange3,kwikadi/orange3,cheral/orange3,qPCR4vir/orange3,cheral/orange3,kwikadi/orange3,kwikadi/orange3,qusp/orange3,qusp/orange3,cheral/orange3