make copy of top-paper childNodes array-like:
make copy of top-paper childNodes array-like:

- as childNodes prop gets mutated in top-group loop

etpinard/plotly.js,aburato/plotly.js,etpinard/plotly.js,etpinard/plotly.js,aburato/plotly.js,plotly/plotly.js,plotly/plotly.js,plotly/plotly.js,iongroup/plotly.js,iongroup/plotly.js,asolagmbh/plotly.js,iongroup/plotly.js,asolagmbh/plotly.js,plotly/plotly.js,asolagmbh/plotly.js