Shortcuts
- Right-drag: pan · Scroll: zoom
- Left-drag empty: rectangle select
- Click node: select · Shift-click: add
- Drag node: move · Arrows/WASD: nudge
- Del: delete selection · Ctrl+C/V: copy/paste
- Double-click node: edit label · Space: toggle done
- Drag from edge handle to another node to connect
- Drag a node over another node until it highlights, then drop to nest
- Shift+click an arrow: toggle dashed (maybe)
- Ctrl+Z/Y: undo/redo