Steps to reproduce:

1. Go to map;
2. Create new map with big width and height;
3. Add two elements A and B;
4. Link those elements;
5. Take element B and drag it far in the right side of the map;

Additionally for bigger maps, it isn't handy to move back at the top left corner of map only by scrolling down to the end of the map where horizontal scrollbar is available.
Arrow keys and home/end buttons improves this - how to navigate through the map, but not entirely sure if this solution is the best for it.

Result:

Expected:
It's possible to drag element further and it follows mouse cursor.