Collapsed network expand themselves on clicking another item in bufferview
Steps to reproduce:
1. Add at least two networks to bufferview (in my case there're three networks).
2. Collapse one of them.
3. Click it (not the + sign near it, click on it to select).
4. Click on any other item in the bufferview.
Result: collapsed network expands.
Quassel revision: 5fb10a113080b9783d2ca44ecd7e057d84fdb659