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Undo: (key: Alt-z) will undo the last change to the tree, ie a cut, copy, paste, add or delete.
Redo: (key: Alt-y) will redo the last undo.
The next four buttons provide cut/paste for Text (not nodes), but they are not functional yet, and are always grayed out. Copy: (key: Alt-c) [unimplemented] Cut: (key: Alt-x) [unimplemented] Paste: (key: Alt-v) [unimplemented] Delete: (key: DEL) [unimplemented]