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Persistent graph view

Jens N requested to merge persistent-graph-view into main

As suggested in #40 I implemented persistent positioning for graph nodes. Heads-Up: This is the first thing I ever did with rust, so it's hard for me to judge my codes quality. (Primarily I did this to get my personal version to a workable state)

A few more remarks / things to keep in mind for the future:

  • Yes, this is a big change.
    • I'm not mad if this does not get accepted as-is ;)
    • If you don't want to include it like this, feel free to give feedback or just use it as (working) reference for your own implementation
  • It might make sense to make this behavior optional e.g.:
    • Add a configuration section (or even just right-click context menu) with a toggle to save/restore node positions
    • Open a one-time dialog when first manually moving a node asking whether node positions should be permanent or not (could be reset by deleting the configuration file for the start)
  • The relatively unique "ident" already works quite good, but is certainly not perfect
    • Add auto-incrementing suffix if multiple nodes with the same ident appear

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