New data at .data() makes svg to redraw instead of updating nodes position

[mjmlopes]

Considering this working example https://bl.ocks.org/colbenkharrl/21b3808492b93a21de841bc5ceac4e47, the data update makes the svg update without being re-drawn.

However, if the node and links data reference is new, even if the contents are the same, the svg is re-drawn on every update.

Here https://jsfiddle.net/nx9wctdk/ , inside the function update(), the call update_local() will make the graph working as expected. The call update_http() will make the graph to be re-drawn.

Tested with D3 v4.13.0 and D3 v6.3.1 in Firefox 78.6.0esr and Chrome 86.0.4240.111. No errors are thrown on dev tools.

Thanks.

[mbostock]

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