set plot_bgcolor from axes.supplyDefaults so we know if we have 2D axes
set plot_bgcolor from axes.supplyDefaults so we know if we have 2D axes

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