This sadly came out as a combination of what I consider a bugfix and a feature patch:
The attached patch adds a menu entry to access host's graphs. It's (hopefully) working everywhere this menu is available:
- Monitoring/Latest data
- Dashboard: Last 20 issues
- Monitoring/Overview – Hosts location: Left; Data and Triggers
Sets groupid=0 for the menu entries screens, graphs, trigger status and latest data. I consider the original version bad, because it takes you wherever, if the hostid does not belong to the host group currently set in the filter.