Bug#795390: mutter: Screen update problems with nvidia drivers

[Mert Dirik]

severity -1 |normal
retitle -1 |Screen update problems with nvidia drivers
thanks

Raising the severity and changing the title since mutter 3.18 has been 
released with the aforementioned fix, hit the testing, and didn't cause 
any problems so far, so it can be brought to release team's attention.

Would you want me to contact the release team about it?