Scroll doesn't work in the pipeline browser
Here is what I have:
- macOS Sierra
- qt 5.9.1 (homebrew)
- ParaView master (6/7/2017)
When there are enough pipeline object to require the scrollbar, the scrollbar does not appear and it is not possible to scroll with the touchpad using two fingers. I noticed that the scrollbar appears once initially but doesn't come back afterwards.