Should Point.add() modify both points?

@estesbubba wrote:

So I'm following this to offset copy & paste so the nodes aren't on top of each other.

https://gojs.net/latest/extensions/DrawCommandHandler.js

When I make the call to Point.add() it actually modifies both points so each paste doubles the offset from the previous paste. Here is my code with some console.logs() in it.

  onPasteFromClipboard = scope => {
    const { pasteOffset, lastPasteOffset } = this.state;
    const parts = go.CommandHandler.prototype.pasteFromClipboard.call(scope);

    console.log(`before pasteOffset ${JSON.stringify(pasteOffset)}`);
    console.log(`before lastPasteOffset ${JSON.stringify(lastPasteOffset)}`);

    scope.diagram.moveParts(parts, lastPasteOffset);
    this.setState({ lastPasteOffset: lastPasteOffset.add(pasteOffset) });

    console.log(`after pasteOffset ${JSON.stringify(pasteOffset)}`);
    console.log(`after lastPasteOffset ${JSON.stringify(lastPasteOffset)}`);

    return parts;
  };

I do a single copy then multiple pastes and here is the console output.

before pasteOffset {"x":90,"y":90}
before lastPasteOffset {"x":90,"y":90}
after pasteOffset {"x":180,"y":180}
after lastPasteOffset {"x":180,"y":180}

before pasteOffset {"x":180,"y":180}
before lastPasteOffset {"x":180,"y":180}
after pasteOffset {"x":360,"y":360}
after lastPasteOffset {"x":360,"y":360}

before pasteOffset {"x":360,"y":360}
before lastPasteOffset {"x":360,"y":360}
after pasteOffset {"x":720,"y":720}
after lastPasteOffset {"x":720,"y":720}

So it appears looking at the output that lastPasteOffset.add(pasteOffset) is modifying both lastPasteOffset and pasteOffset. Should it be doing this?

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