This is less a real patch and more a "live mockup" to test some ideas for possible changes to Camera View. This is mostly motivated by my dislike for the dashed lines used there, but I also like the idea of having it look more recognizably as a camera viewfinder. Also makes it work better for different dpi and line width (and Macs that don't do wide gl lines).
Following shows an **inactive** camera along with center composition guides:
{F9276484}
Inactive camera, locked to view, and "Thirds" guides:
{F9276491}
**Active** camera, showing safe areas and with golden ratio guides:
{F9276503}