Option to close/delete views or layers

[ren-zeng]

No description provided.

[pettter]

Self-TODO:

Basically, the procedure to accomplish this (in the back-end) would be to:

• In the graph
  • If a node only corresponds to a note in the layer to be deleted
    • Remove the node, and any relation involving it (possibly configurable), and cascade this into meta-relations etc.
• In other layers
  • If they are copies/derived from notes in the deleted layer
    • Find the new "topmost" referent, and redirect all the references to the deleted note there instead, including if there is some node in the graph referring there
• Finally, remove the layer mdiv
• Also remove the relevant elements in the UI

In terms of the UI, there would need to be a button to do this per layer, and possibly a confirm/configure dialogue, especially if there are notes/nodes/relations that might be deleted

Ideally, this whole system should also be integrated into the undo/redo system