Quick navigation quickly closes after opening

Hi,

I am not sure how to explain this, but sometimes the quick navigation closes right after it opens. I've made a video of it, you should see what happens in the first couple of seconds, it then starts working.

https://drive.google.com/file/d/0B1RZ9H34UnlUdzNmZFVMTTlHak0/view

Using RubyMine 2017.2 on Linux