apply legend border styling on merge selection [fixes #649]
apply legend border styling on merge selection [fixes #649]

- instead of just the enter selection.

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