Background:
- With many nodes, D3 force simulation tick callback updates all nodes/edges/labels every frame
- Original implementation called simulation.restart() in drag start event on mousedown
- Even after simulation converged, clicking a node to view details would restart simulation, causing lag
Solution:
- Distinguish between "click" and "drag" using 3px movement threshold
- On drag start: only record initial position, do not restart simulation
- On drag event: detect movement exceeding threshold before marking as actual drag and restarting simulation
- Pure click operations no longer trigger simulation restart, keeping graph static
Bug fix:
- Fixed issue where nodes became undraggable after initial optimization
- Cause: incorrectly used if(!event.active) check in drag event
- event.active equals 1 during drag event, causing restart() to never execute
- Removed that condition, using custom _isDragging flag to control logic instead
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