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Implements fold and unfold. See screenshots for keyboard shortcut examples (which is how I have been using this locally for rapid navigation).
I have found my use cases to be:
mindmap-view.ts
'sregisterActiveLeafUpdate()
)As a design decision / consideration, I did not implement expand / fold next level, because when I mapped to the keyboard shortcuts in the screenshot given, it was very nice for me to jump to a specific fold level, or unfold all. That provided me a muscle memory indication (specific key shortcuts) of exactly which level I was reading, which would not be possible if I was implementing an "increase fold" or "decrease fold" shortcut.