Tensor and Connection sidebar return to Node sidebar

[Kyle Sayers]

I often find myself wanting to inspect all the tensors related to a node. However, the current UI makes this difficult to do since closing a tensor properties sidebar closes the entire sidebar, forcing me to find the node in the graph again.

It would be nice if closing a tensor sidebar or connections sidebar returned back to the node sidebar that it came from.

I've implemented this change here (#1298). Since this is a stylistic change, I'd be interested in hearing other people's opinions on this.