Drag and drop of material issue WIP rel6.0.17283.9031, 2017/10/10

Had this problem before, but when trying to drag and drop a material in
rendering viewport can’t highlight the right one.
Posting file. For the cones I’m can’t seem to highlighted it.
I can right-click on material and apply from there but dragging is a bit faster.
(if highlight object first then drag&drop works that’ll be also good)

Studio_Setup.3dm (348.6 KB)