[Feature] Copy/Paste and Undo/Redo editor actions about nodify HOT 2 CLOSED

Hi! The provided controls do not hold too much state because everything is intended to be controlled by the view model. Of course, I could have an undo action for basic things like moving a node or zooming the canvas, etc. But that would surely interfere with your custom-made undo-redo solution, over-complicating things. Then we need to think about what stays in memory and for how long, then make sure that the view does not get out of sync with the view model. In the case of copy-paste, how would you validate that copy-paste is allowed? The graph may be read-only or some of the nodes should be unique. These rules are application-specific. Even if I tried implementing something in the library, it wouldn't be generic enough to cover all cases.

However, I had an attempt at creating a separate library at some point in time which would implement most of the common functionality you see in a node editor in a generic way so you can use it as a base. Here's the PR if you are interested: #36 . And here are the relevant files for undo/redo: https://github.com/miroiu/nodify/tree/feature/new-blueprint/Nodifier/UndoRedo

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Closing this as not planned. Please feel free to reopen the issue if you need more information.

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