This improves working with viewer nodes in geometry and compositor nodes.
Previously, the viewer node would typically stay at the position where it was first
inserted which leads to very long links in many cases. Now the viewer node
automatically moves to the place where the user ctrl+shift+clicked to view data.
The viewer is placed slightly to the right and top of the current node. It is moved
up a bit, so that it does not get in the way as quickly when the user wants to add
another new node. Furthermore, the viewer node position is chosen so that it
does not intersect with other nodes.
In the future we could implement animating the node position so that it slowly
transitions to it's new places.
Pull Request: https://projects.blender.org/blender/blender/pulls/121951
7be4d4f443