Animated growth of entering edges looks bad on Chrome & Safari

[magjac]

Some arrowheads have the wrong direction during transitions and the edges are grown i segments. On Firefox is looks good.

The root cause is that the getTotalLength() method is undefined here and the test workaround for jsdom/jsdom#1330 kicks in. Probably this is because the element is part of a DocumentFragment.

[magjac]

If a DocumentFragment is not used, but the initial SVG is instead created directly in the DOM, the problem does not occur, but this approach may have performance implications.

[magjac]

There was no measurable performance difference between the DOM and the Document Fragment approach. A few ms for a graph with 20 nodes and 15 edges. The layout and data extraction require magnitudes longer time.