Remove forced simulation restart from d3 drag event

[replygirl]

Previously, after a couple seconds of dragging, the simulation would stop and the svg would no longer be interactive.

I fixed this by forcing a simulation restart on every drag—i.e., every time the cursor moves while dragging. This is correct for drag starts, but while dragging this slows down the framerate a little.

Would b nice to find a way out of my hacky solution

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